A case of an AIDS patient with a CMV-infected subependymoma of the fou
rth ventricle is presented. The tumor was incidentally found at autops
y and was not suspected during the clinical course. This is the first
report of a subependymoma in HIV-1 infection. Moreover, infection of a
tumor with CMV is an extremely rare condition, which has until now be
en described only once in an anaplastic astrocytoma.