To illustrate and describe salient radiological features of intraventricular CNS lesions on conventional and advanced MRI and CT. To elucidate that patients age, gender, location of lesion in the ventricular system are crucial to establish differential diagnosis.

A variety of lesions arise in the ventricular system. Clinical features depend on the the intraventriclar lesion size and location Many intraventricular lesions have similar imaging features and may pose difficulty in diagnosis. Knowledge about imaging features of intraventricular lesions & making correct diagnosis has important clinical meaning: neurosurgical intervention endovascular intervention deciding the next investigation Classification of intraventricular lesions. Intraventricular lesions can be classified into tumoral , cytsic , vascular & infectious lesions or can be classified into soild and cystic lesions.Refer fig 1...

•We retrospectively reviewed histo-pathologically confirmed intraventricular lesions including intraventricular tumoral, cystic, and infectious lesions who underwent MRI and CT in our department. •Salient imaging findings with key points were described including CT, conventional and advanced MRI. INTRAVENTRICULAR TUMORS: EPENDYMOMA Fig. 6 Age & Location: posterior fossa more common in children (mean age –6 years) ,supratentorial lesions –18 –24 years NECT -4THventricle mass ,Ca++common(50%);±cysts, hemorrhage ,Hydrocephalus common CECT - Variable heterogeneous enhancement MR findings: T1WI Heterogeneous ,usually iso- to hypointense Cystic foci slightly hyperintense to CSF...

Intraventricular lesions comprise a wide spectrum of tumoral , cystic , vascular & infectious disorders. Intraventricular CNS lesions can pose as a diagnostic challenge as many of the lesions have similar imaging appearances. Patient’s age, gender, location of the lesion in the ventricular system, clinical features and imaging findings can help narrow the differential diagnosis.

U. V. Desai; Bengaluru/IN - Author at M.S.RAMAIAH HOSPITAL D. A. Jain; Bengaluru/IN - nothing to disclose U. Krishnamurthy; Bangalore, KARNATAKA/IN - nothing to disclose

Osborne's brain, 2nd edition Neuroradiology, The requisites 4th edition Koeller KK,Sandberg GD.Cerebral intraventricular neoplasms: radiologic-pathologic correlation.RadioGraphics2002;22(6):1473–1505