Congenital intracranial tumors containing cholesterol and fatty material are characterized by negative absorption values on computed tomography. The first case in which free intraventricular fat was seen on CT was reported by Fawcitt and Isherwood. The authors have encountered two patients with intracranial epidermoid tumors with negative absorption values. Of greater interest, however, was the presence of freely movable fatty material within the cerebrolspinal fluid pathways. The first patient had undergone surgery, possibly explaining the distribution of free fatty material, but the second had not. Both patients had fat in the subarachnoid space, a CT finding not previously reported. Neither patient had clinical evidence of aseptic meningitis or other clinical findings attributed to rupture or leakage of epidermoid tumors.
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging