MR imaging of choroid plexus lipomas.

Pericallosal lipomas, also known as lipomas of the corpus callosum, are well described in the radiologic literature. Formerly thought to be rare congenital tumors, they have been identified with more frequency since the advent of CT and MR imaging. Pericallosal lipomas are the most common type of intracranial lipoma (1-4]. With lesser frequency, subarachnoid lipomas are noted in other locations, including the quadrigeminal, ambient, chiasmatic, interpeduncular, perimesencephalic, and sylvian cisterns (2, 5) . Occasionally, intracranial lipomas have also been noted within the substance of the choroid plexus of the lateral ventricles in association with pericallosallipomas (2, 6, 7] . To date, however, MR images of choroid plexus lipomas have not been reported . This paper describes the MR findings of a case of pericallosallipomas with contiguous choroid plexus lipomas and a right sylvian fissure subarachnoid lipoma.