Understand and identify the different both benign and malignant intracranial cystic lesions and a review of these lesions by age of onset, location and radiographic appearance to make a correct differential diagnosis.

Cystic lesions are usually a common finding in clinical practice can find in any diagnostic technique (ultrasound, CT and MRI)

These lesions can be classified as: 1. Normal variants Cavum septi pellucidi: The septum pellucidum consists of two thin sheets of white matter surrounded by gray matter. The persistence of this septum after birth is called cavum septi pellucidi. (Fig 1) Cavum veli interpositi: An anatomic variant that may appear as a cyst in the pineal region observed in neonatal ultrasound studies, the internal cerebral veins flows inferiorly. (Fig 2) Cavum vergae: Consists of the permanence of the liquid cavity between the two layers of...

There is a wide spectrum of organizations, knowledge of the radiologic features and its location allows us to narrow the list of differential diagnosis.

1. Intracranial Cysts: RadiologicPathologic Correlation and Imaging Approach Anne G. Osborn, MD Michael T. Preece, MD Radiology: Volume 239: Number 3—June 2006 2. Differential Diagnosis of Intracranial Cystic Lesions at Head US: Correlation with CT and MR Imaging Monica Epelman, MD Alan Daneman RadioGraphics 2006; 26:173–196 3. Posterior Fossa Malformations Karuna Shekdar, MD Semin Ultrasound CT MRI 32:228-241