3rd ventricle tumors Radiology

Third ventricle masses can be classified as arising in or immediately adjacent to one of five locations: anterior, posterior, inferior, foramen of Monro, and intraventricular. Anterior masses involve the optic and infundibular recesses, posterio Intraventricular neoplasms are rare and arise from periventricular structures such as the walls of the ventricular system, the septum pellucidum and the choroid plexus.. Many tumor types arise from or can bulge into the ventricular system, although there are certain lesions that are relatively restricted to ventricles Tumors of the third ventricle constitute an uncommon subset of suprasellar masses. These tumors have been addressed previously from both radiologic and pathologic perspectives (9-12) Intraventricular masses (an approach) The ventricular system of the brain plays host to a variety of unique tumors, as well as tumors that are more frequently seen elsewhere (e.g. meningiomas). Besides, some intra-axial (parenchymal) masses can be mostly exophytic and thus appear mostly intraventricular The differential diagnosis of lateral ventricular tumors was explored by retrospective analysis of 47 pathologically proved cases identified by CT and{or MR imaging. Third ventricular tumors adjacent to the foramen of Monro (e.g., colloid cysts) were excluded. Forty-six patients underwent CT, and eight had MR imaging. The most common neo

Intraventricular neoplasms and lesions Radiology

  1. Third ventricle tumors are uncommon and account for 0.6 - 0.9% of all the brain tumors. Tumors of the third ventricle are classified into primary tumors, such as colloid cysts, choroid plexus papillomas, and ependymomas, or secondary tumors, such as craniopharyngiomas, optic nerve gliomas, pineal tumors, and meningiomas
  2. Central lesions within or around the third ventricle (suprasellar, thalamic, or pineal region tumors) can be biopsied endoscopically at the time of third ventriculostomy, often indicated to decompress the ventricular system in preference to a ventriculoperitoneal shunt at diagnosis
  3. This interesting monograph presents a series of twenty-one cases, chiefly tumors in the region of the third ventricle, which are a tribute to the courage and surgical expertness of the author. Considering the nature of these tumors, the mortality (33 per cent) has been reasonable and the postoperative results in the survivors must be a source.
  4. 27. Types of posterior third ventricular masses 1. GLIAL TUMORS 25% of the posterior third ventricular masses are astrocytomas. Ependymomas, oligodendroglioma, and GBM can also occur. Occur in either sex at any age. Imaging is the same. Total resection is rather impossible, may require adjuvant therapy. 28
  5. The breadth of tumors that can arise in the supratentorial brain in children is extensive. With the exception of those that result in seizures and the highly malignant histologies, supratentorial tumors may come to medical attention later compared with infratentorial tumors, as they are less commonly associated with ventricular obstruction
  6. RATIONALE: Central neurocytoma is rare benign tumor that occurs in high probability in young adults in the lateral ventricle. Herein, we report an unusual case of an elderly woman who was diagnosed with central neurocytoma isolated to the third ventricle. This deeply located tumor was effectively treated using gamma knife radiosurgery (GKR)
  7. A 70-year-old with a history of atrial fibrillation and prostate cancer, and thalassemia had a third ventricular mass incidentally detected on a brain MRI. IMAGING FINDINGS. A contrast-enhanced T1 image showed an enhancing mass located in the anterior third ventricle near the foramen of Monro (Figure 1)

Chordoid Glioma: A Neoplasm Unique to the Hypothalamus and

Tumors primarily located in the third ventricle are rather rarely encountered when one considers the relative frequency with which other portions of the brain are involved by neoplastic diseases. Weisenburg, 1 in 1910, found twenty-seven such cases in the literature, reporting at the same time three of his own Tumors commonly encountered in the third ventricle include colloid cysts, craniopharyngiomas, ependymomas, gliomas, and pineal region tumors. Cavernous malformations and tectal tumors can also secondarily involve the third ventricle and should be considered in the differential diagnosis. For a more detailed description of these tumors, see the.

We present the clinical and imaging findings in a patient with a colloid cyst, and provide a gross anatomic and histopathologic correlation. Correlations between MRI features and cyst content could potentially help surgeons decide on the extent of resection and approach. Colloid cysts are among rare benign tumors of the third ventricle A CT scan showed a round cystic mass in the third ventricle which was interpreted as a colloid cyst. A myodil ventriculogramm showed the anterior part of the third ventricle completely occupied by tumour

Intraventricular masses (an approach) Radiology

MRI demonstrated a third ventricle tumor causing noncommunicating hydrocephalus, although an MRI 16 weeks before admission did not show the lesion. We performed gross total resection (GTR) of the tumor in 2 stages: a translamina terminalis approach and an extended transsphenoidal approach We have divided the lesions in our follow-up series into five groups according to tumor location: 22% of tumors were located within both lateral ventricles, 18.5% occurred in the third ventricle, 19% were tumors of the hypothalamic and suprasellar region, 14% were located within the fourth ventricle, and 26% were found in the pineal and mesencephalic tectal region For small tumors in the lateral and third ventricles, direct endoscopic biopsy and resection is possible. However, for larger tumors, a brain-port is helpful for better tumor access and control. For 4th ventricle tumors, a suboccipital approach is utilized, with endoscopic assistance when necessary Tumors arising within the third and lateral ventricles are frequently (but not always) slow-growing and benign, 4,5 whereas lesions arising from the fourth ventricle may be rapidly progressive due to cerebrospinal fluid (CSF) obstruction and brainstem signs and include both benign and malignant pathological types

Franko A, Holjar-Erlić I, Miletić D. Lateral ventricle epidermoid. Radiology and Oncology. 2008;42(2). Behari S, Jaiswal S, Nair P, Garg P, Jaiswal AK. Tumors of the posterior third ventricular region in pediatric patients: The Indian perspective and a review of literature. Journal of pediatric neurosciences. 2011;6(Suppl 1):S56-71 Third ventricular tumor treatment A plethora of surgical strategies have been described to reach deep-seated lesions situated within the third ventricle including the Rosenfeld, or transcallosal anterior interfoniceal approach. Third ventricle tumors are surgical challenges because of the complex surrounding structures, including the hypothalamus, infundibulum, optic pathways, limbic system. Ependymomas of the third ventricle are quite rare and are rarely described. The tumors prevalent in this region include gliomas, metastases, germinomas, pinealomas, and cysts (3). In this report, we present four cases of third ventricular ependymomas and review the literature on this unusual entity Masses: Deformities of the different segments of the floor can be caused by tumors of the posterior fossa and hydrocephalus. Longstanding hydrocephalus and increased intracranial pressure: The third ventricle is a common site for anatomical variations in people with congenital hydrocephalus, a hereditary condition that causes excess CSF production.. Hydrocephalus enlarges the third ventri Magnetic Resonance Imaging. Colloid cysts are well demonstrated on MRI scans and are found near the foramen of Monro, just posterior to the fornices in the anterosuperior third ventricle. The MRI findings depend on the composition of the cyst content, that is, cerebrospinal fluid-like or mucous cyst content. Approximately half of the cysts.

Cureus Third Ventricular Tumors: A Comprehensive

intraventricular tumors by ventricular location. The imag-ing characteristics of these lesions are also described in Table 2.75,85,124 Although these distinctions may seem arbi-trary as most of these tumors occur in patients throughout the ventricular system and across a wide range of ages, tumor location, age of the patient, and imaging character Reifenberger, G, Weber, T, Weber, RG, et al. Chordoid glioma of the third ventricle: immunohistochemical and molecular genetic characterization of a novel tumor entity. Brain Pathol 1999 9 : 617 -26

However, this tumor largely involves the pineal region, the posterior third ventricle and the cerebral aqueduct, which causing hydrocephalus. In our opinion, other lesions in the pineal gland should be included in the radiological differential diagnosis, such as cystic hemangioblastoma, pilocytic astrocytoma, germinoma, pinealocytoma. Lesions in the 3rd ventricle can be broadly classified into anterior recess, posterior recess and intrinsic 3rd ventricular mass lesions. Imaging with MR is the key to their diagnosis. Management of these lesions can be surgical or nonsurgical depending on the diagnosis and presentation

One of the most important roles of imaging is to assess the extent of a tumor. On the left a tumor located in the 3rd ventricle. The tumor contains calcifications. The diagnosis is a giant cell astrocytoma. 4th ventricle. In children tumors in the 4th ventricle are very common Colloid cysts of the third ventricle are benign tumors that accounts for 0.5-3% of primary brain tumors. As such, they can only be seen using cross-sectional imaging techniques. Most cases are found incidentally in middle age (the fourth decade), though some may be rapidly symptomatic and diagnosed in the pediatric age Furthermore, sagittal CISS MR imaging allows evaluation of the anatomy of the floor of the third ventricle prior to third ventriculostomy and helps to evaluate the patency of a previously performed third ventriculostomy. Because these tectal gliomas may be small or compressed due to a hydrocephalus, they can easily be missed on initial imaging

Supratentorial Brain Tumors Radiology Ke

colloid cyst in the third ventricle. The patient was ad-mitted at Clinic of Radiology, with symptoms of head-ache and episodes of vomit. In clinical examination pa-tient had symptoms of brain tumor. He was treated for depression since 2017. A year ago he underwent a MRI head scan, where dilation of lateral ventricle was seen a Spontaneous tumor bleeding is a very uncommon finding of craniopharyngioma . Hypothalamic-chiasmatic glioma also appears as third ventricle tumor, which shows a more aggressive clinical course in adults . Larger tumors tend to be heterogeneous with both cystic and solid components . Chordoid glioma is another anterior third ventricle neoplasm.

Benign Tumors in the Third Ventricle of the Brain

Magnetic resonance imaging is useful for detection of tumors in the third ventricle. To give a definitive diagnosis of glioblastoma multiforme, HP findings could be performed. Primary way of treatment is tumor resection and the best option for surgical approach to the tumor mass in the third ventricle is interhemispheric, anterior transcallosal. Colloid Cyst of the Third Ventricle. General Considerations. Benign, epithelium-lined cysts; Most common tumor of the third ventricle but rare overall; Usually found in adults in their 40s or 50s; Arise from anterosuperior aspect of 3 rd ventricle near the foramina of Monr The third ventricle is an uncommon location for choroid plexus papillomas. In adults, these tumors most commonly occur in the fourth ventricle. In children, they are more commonly found in the lateral ventricles. When these lesions are discovered in the third ventricle, they are often posteriorly located. Hydrocephalus and macrocephaly are. Purchase Diagnostic Imaging: Brain - 3rd Edition. Print Book & E-Book. ISBN 9780323377546, 978032340043

Inevitably, all approaches to the third ventricle require passing through some neural structures (26). Most lesions affecting the third ventricle, including tumors, cysts, and vascular malformations, can be treated successfully by microsurgical techniques, but the surgical approach must be planned carefully A 17-year-old male patient presented to the clinic with a headache, nausea, and vomiting. Magnetic resonance imaging demonstrated a fat-containing and -enhancing heterogeneous tumor in the third ventricle, and fat droplets within the ventricles and the subarachnoid space. Obstructive hydrocephalus was also present. Emergency subtotal removal of the mass was performed via interhemispheric.

Brain magnetic resonance imaging (MRI) demonstrated a round cystic lesion of the third ventricle, accompanied by hydrocephalus with enlargement of lateral ventricles. MRI findings were highly. Colloid Cyst of the Third Ventricle. This CT scan shows a small hyperdense lesion marked by the crosshairs. This is a colloid cyst. A colloid cyst is a benign lesion that arises from a vestigial brain structure called the paraphysis. All colloid cysts of the brain occur in this same exact location Colloid Cyst of the Third Ventricle. There is a high attenuation mass in the anterior aspect of the third ventricle (white arrow) causing obstruction at the foramina of Monro with resultant hydrocephalus, left (yellow arrow) frontal horn worse than right (blue arrow) on the axial CT scans (above) Colloid cysts of the third ventricle are described in middle-aged twin brothers. One of them presented with recurrent attacks of headache. In this patient the cyst had reached a size large enough to obstruct the cerebrospinal fluid pathway, resulting in hydrocephalus

Third ventricular-masses - SlideShar

Supratentorial Tumors in Pediatric Patients Radiology Ke

A brain MRI revealed a 3.1 × 4.2 × 4.5 cm well defined multi-lobulated tumor in the anterior third ventricle and suprasellar region displacing the right lateral ventricle superiorly . The mass showed iso-signal intensity on both T1- and T2-weighted images relative to the brain cortex mass in the third ventricle revealed by CT or MRI, should raise the suspicion of meningioma as one of the possible diagnoses. References 1. Albert, P.: Tumors and other space occupying lesions of the anterior part of the third ventricle. Neurocirugía 1999; 10: 27-41 2. Apuzzo, M.L.J., Litofsky, N.S.: Surgery in and around the Anterior Third. 1 INTRODUCTION. The third ventricle occasionally can be affected by neuroepithelial tumors arising from the lining epithelium of the ventricle (ependymomas) or choroid plexus (choroid plexus tumors). 1 Ependymomas rarely are reported in domestic animals, with cats more frequently affected than dogs. 2, 3 Choroid plexus tumors are more common, comprising approximately 7% of all primary tumors. It is most commonly observed in the lateral ventricles of the brain; other possible locations include the fourth ventricle, the third ventricle, the cerebellopontine angle, and cerebral parenchyma. On MRI of the brain, which is the diagnostic investigation of choice, CPP appears as a lobulated heterogeneous mass with intense enhancement Germ cell tumors or Central nervous system germinomas likewise occur in the central part of the brain but their tendency to seed through the ventricles requires radiation treatment in two phases: One encompassing all the ventricles of the brain and the second focused just on the tumor. Proton therapy for tumors of the third ventricle region can.

Tumor control of third ventricular central neurocytoma

The third ventricle resides deep in the brain, close to the middle of the head. Colloid cysts are attached most commonly either to the roof of the third ventricle or to the choroid plexus—a structure at the center of the third ventricle. Both these locations are in proximity to crucial routes for fluid and blood circulation Non-invasive imaging modalities such as MR spectroscopy helped us confirm the diagnosis of a malignant epidermoid cyst from the third ventricle. CONCLUSION We have presented a rare case of a third ventricular lesion presumed to be an epidermoid tumor as seen on MRI MRI is superior to CT in fully characterising the lesion. appear as a rounded, sharply demarcated lesion at the Foramen of Monro, which range in size from a few millimetres to 3-4 cm (3). CT: Typically seen as a well defined, rounded lesion at the roof of the 3rd ventricle: unilocular. typically hyperdense A 45-year-old female patient presented with symptoms of polydipsia and polyuria, menopause, headache, gait disturbance and deteriorated mental state. Brain magnetic resonance imaging (MRI) showed an irregular mass in the anterior third ventricle. The tumor was excised using a transfrontal approach from the anterior section of the third ventricle third ventricular craniopharyngiom At the level of occipital horns revealed largest dimension of hyperdense mass in third ventricle associated with ventricu-lomegaly. Figure 4. Mid sagital T2 weighted spin-echo (SE) magnetic resonance imaging (MRI) of a 22-year-old woman with intrinsic third ventricular craniopharyngioma

Covering the entire spectrum of this fast-changing field, Diagnostic Imaging: Brain, fourth edition, is an invaluable resource for neuroradiologists, general radiologists, and trainees—anyone who requires an easily accessible, highly visual reference on today's neuroimaging of both common and rare conditions.World-renowned authorities provide updated information on more than 300 diagnoses. Colloid cyst accounts for less than 2% of all primary brain tumors. More than 99% of all colloid cysts are reported to occur at the frontend (rostral) of the third ventricle, at or near the foramen of Monro. The foramen of Monro is the conduit of cerebrospinal fluid (CSF) outflow from the lateral ventricles to the third ventricle Rosette-forming Glioneuronal Tumors in the Posterior Third Ventricle - Volume 40 Issue 6. Skip to main content Accessibility help We use cookies to distinguish you from other users and to provide you with a better experience on our websites Free Online Library: Colloid cysts of the third ventricle exhibit various clinical presentation: a review of three cases.(Report) by Bosnian Journal of Basic Medical Sciences; Biological sciences Cerebrospinal fluid Health aspects Intracranial tumors Care and treatment Diagnosis Magnetic resonance imaging Usag Case 2a. Fourth-ventricle ependymoma in a 63-year-old man with headaches. T1-weighted sagittal image demonstrates an oval, fourth ventricular tumor with hypointense signal (likely from tumoral calcifications, confirmed on gradient echo sequence). Moderate obstructive hydrocephalus of the lateral and third ventricles is noted

Article - Hemangiopericytoma of the Third Ventricl


The tumors were located in the third ventricle in twenty-three (54.8%), in the lateral ventricles in eighteen patients (42.8%), and in both lateral and third ventricle in one patient (2.4%) Ventricular Tumors choroid plexus papilloma (24%) choroid plexus carcinoma ependymoma (18%) subependymoma (11%) central neurocytoma (10%) subependymal giant cell astrocytoma all other astrocytomas meningioma colloid cyst met Lateral Ventricle Mass by Age and Location 0-10y body: primative neuroectodermal tumor, teratoma, choroid plexus papilloma trigone: choroid plexus papilloma 10-40y foramen. It is a highly vascular tumor. It is usually an intraaxial, posterior fossa mass, most of the time located in the cerebellar hemispheres. It can also be located in the cerebellar vermis, in the fourth ventricle or in the spinal cord. 25-40% of these tumors are associated with Von Hippel Lindau syndrome Imaging Findings. On CT, posterior fossa ependymomas appear as fourth ventricular masses with solid components which are typically isodense to mildly hyperdense compared to surrounding brain parenchyma. Lesions result in obstructive hydrocephalus with nausea and vomiting in roughly 90% of patients Institute of Radiology (CC), Universita` degli Studi di Chieti, Chieti, Italy OBJECTIVE: Craniopharyngiomas usually grow on the cisternal surface of the hypothalamic region; these tumors can also grow from the infundibulum or tuber cinereum on the floor of the third ventricle, developing exclusively into the third ventricle

Saarland University Medical Center - Endoscopic third

Introduction to Third Ventricular Tumors The

and a magnetic resonance imaging (MRI 1.5T). MRI revealed a well-defined mass in the anterior third ventricle and the foramen of Munroe with an associated MTS (Figure 1a,b). S-VEEG showed a right temporal ictal onset corresponding to the MTS. The third ventricular tumor was resected through an interhemispheric, transcallosal approach To determine if ventricular volume affects the ADC values, the volume of the lateral, 3rd and 4th ventricles were measured by consensus using imaging biomarker explorer (IBEX) software that was developed in-house and enabled us to measure the ventricular volumes [].For comparison in both the LMD and control groups, the presence of leptomeningeal enhancement and FLAIR signal. Diagnosis: Third Ventricle Arachnoid Cyst. Arachnoid cysts form when the two layers of the arachnoid membrane split and a potential cavity is formed. The cavity fills with cerebrospinal fluid by an unknown mechanism, thought to be CSF pulsations. They can continue to grow as CSF flows in and is trapped Resection of Large Third Ventricular Tumors - Expanding the Operative Corrido

The hypothalamus is found in the region below the thalamus, a structure that makes up most of the lateral walls of the brain's third ventricle (1). The h ypothalamus is a small cone-shaped structure that is an integral part of the brain, functioning as a control center of the autonomic nervous system (2) Despite this relative lack of contrast, with multiplanar imaging plain MR delineates pineal region masses better than CT, showing the relationships of the tumor to the posterior third ventricle, vein of Galen, and aqueduct. These tumors are well defined and enhance to a moderate degree, usually without central necrosis, cystic change, or. The first premortem diagnosis of a cardiac tumor was made in 1934, when a sarcoma was identified. 34 Secondary (metastatic) tumors are up to 40 (or more) times more common than primary tumors. Of all cardiac tumors, 94% are benign and 6% are malignant. The most commonly encountered metastatic tumor at autopsy is lung carcinoma (17%) Third ventricle (Ventriculus tertius) The third ventricle is a narrow funnel-shaped cavity of the brain. It is located in the midline, comprising the central part of the ventricular system of the brain . As such, the third ventricle directly communicates with other ventricles: It communicates with each lateral ventricle  via the foramen.

Brain Tumor Right Lateral Ventricle - Brain Tumor CancerDiagnostic Imaging of Pineal Region MassesEpendymomas | Neupsy Key

Colloid Cyst of the Third Ventricle: Case report and

The lateral ventricles resemble a pair of hollow, C-shaped structures. Each lateral ventricle can hold an estimated 7ml to 10ml of fluid(2). The lateral ventricles are made up of a central part or body, an atrium or chamber, and three extensions referred to as horns(3). These extensions are: The anterior or frontal horn Colloid cysts of the third ventricle are benign cysts, but sometimes they can cause sudden death in young adults. Colloid cysts of the third ventricle are rare. They account for 0.5-2.0% of all intracranial tumors and 10-20% of all intraventricular tumors . Colloid cyst is the most common third ventricular mass in adults 50% of tumors are in lateral ventricles, 40% in 4th and 5% in 3rd. Rare - extraventricular areas like CPA, suprasellar cistern etc; Choroid plexus tumors aren't that common overall but 10-20% of brain tumors in those less than 1 yr. 80% are benign papilloma and rest are carcinoma; Those in lateral ventricle are most likely to present ; 1

Sinonasal polyposis with suprasellar mass (presumablyPineal region masses

A papillary craniopharyngioma localized in the third ventricle occurred in a 45-year-old male. The clinical presentation was unusual and the neuroradiological appearance resembled a choroid plexus papilloma of the third ventricle. The tumor originated from the right anterolateral wall of the thir Definition / general. Benign unilocular, epithelium lined, mucin filled cyst of third ventricle ( eMedicine: Colloid Cysts ) Uncertain histogenesis, mostly of endodermal derivation. Usually adults (20 - 50 years), rare in children. Site, radiologic and pathologic features are distinctive so differential diagnosis may be limited A colloid cyst is a non-malignant tumor in the brain. It consists of a gelatinous material contained within a membrane of epithelial tissue. It is almost always found just posterior to the foramen of Monro in the anterior aspect of the third ventricle, originating from the roof of the ventricle.Because of its location, it can cause obstructive hydrocephalus and increased intracranial pressure

Chordoid Glioma is a rare low-grade tumor that is always found in the third ventricle. It is unique in its topography, female gender predominance, stereotypical histology and radiological features. Because of the singular features of chordoid gliomas, these tumors are difficult to group with other neoplasms, and this is why they are included. Colloid cysts are typically diagnosed by magnetic resonance imaging (MRI) or computer tomography (CT) scans of the brain. Specific high resolution MRI sequences can further characterize colloid cysts, how they impact surrounding normal anatomical structures and CSF flow patterns from the lateral into the 3rd ventricle tumors in patched heterozygous (ptc+/−) mice that We report magnetic resonance imaging (MRI) meth- closely resembled human medulloblastoma [7]. ods in two mouse models for medulloblastoma (also To improve specificity in distinguishing tissue char- known as primitive neuroectodermal tumor of the pos- acteristics, investigators have reported. Choroid plexus papilloma of the third ventricle Choroid plexus papilloma of the third ventricle Buckle, Christopher; Smith, J. 2007-04-27 00:00:00 Pediatr Radiol (2007) 37:725 DOI 10.1007/s00247-007-0474-5 CLINICAL IMAGE Christopher Buckle & J. Keith Smith Received: 6 January 2007 /Revised: 11 March 2007 /Accepted: 20 March 2007 / Published online: 27 April 2007 Springer-Verlag 2007 A 2-month. Nervous system tumors have been detected in 1%-3% of necropsies in dogs. In cats, nervous system tumors are less common and are mainly meningiomas and lymphomas. Primary nervous system tumors originate from neuroectodermal, ectodermal, and/or mesodermal cells normally present in (or associated with) the brain, spinal cord, or peripheral nerves

Abstract. Object. To determine the natural history of colloid cysts of the third ventricle in patients in whom the cysts were incidentally discovered, the authors retrospectively reviewed cases observed during the modem neuroimaging era (1974-1998). Methods. During this 25-year interval, 162 patients with colloid cysts were examined and cared. The fourth ventricle outlet obstruction (FVOO) is a rare but well-established cause of obstructive tetra-ventricular hydrocephalus, characterizing with dilatation or large cerebrospinal fluid collection of the foramen of Magendie and foramen of Luschka. Hydrocephalus is classified as noncommunicating and communicating based on whether all ventricular and subarachnoid spaces are communicating Rare, discrete, slow growing glial tumor of third ventricle of adults, characterized by chordoid architecture and myxoid background First described in 1998 (J Neuropathol Exp Neurol 1998;57:283) Cells may resemble ependyma of subcommissural organ, present in dorsocaudal third ventricle during embryonic life, which regresses after birt

The Radiology Assistant : Systematic ApproachHorizontal view t2 mri radiograph - Spinal Cord - RR

Magnetic resonance imaging revealed the bilateral lateral ventricle, the fourth and third ventricle significantly enlarged with severe obstructive hydrocephalus, a huge posterior [ncbi.nlm.nih.gov] It is characterised by: cystic dilatation of the fourth ventricle due usually to absence of the foramina dilatation of the third and lateral. Intraventricular tumors (also known as ventricular tumors) are generally benign tumors or lesions found within the ventricles of the brain. These tumors may arise from a variety of cells in the region and often obstruct the flow of cerebrospinal fluid and cause a buildup of pressure in the skull Ependymomas are relatively rare tumors, accounting for 2-3% of all primary brain tumors. However, they are the third most common brain tumor and spinal cord tumor in children. About 30% of pediatric ependymomas are diagnosed in children younger than three years of age. The location of ependymomas in adults tends to b Colloid cysts are benign neoplasms that develop in the anterior part of the third ventricle roof.[] They constitute a mere 1% of all intracranial tumors and comprise approximately 15-20% of intraventricular neoplasms,[] with an estimated incidence of three people per million per year.[] The majority of patients affected by colloid cysts remain asymptomatic.[ 4th ventricle. In children tumors in the 4th ventricle are very common. Astrocytomas are the most common followed by medulloblastomas (or PNET-MB), ependymomas and brainstem gliomas with a dorsal exophytic component. In adults tumors in the 4th ventricle are uncommon