title: The CT scan: pitfalls and posterior fossa cisternography.
abstract: A case of an inadequately enhanced 4-cm acoustic tumor missed by initial CT scan and diagnosed six months later on a second, different CT scanner is reported. The most common pitfall in acoustic tumor diagnosis by CT scan is the inability to resolve tumors less than 1.5 cm. This necessitates a posterior fossa cisternogram. A method of tumor size classification based on CT scan and cisternography is proposed.
mesh_terms: D003388:Cranial Fossa, Posterior / Q000000981:diagnostic imaging*; D003390:Cranial Nerve Neoplasms / Q000000981:diagnostic imaging*; D003951:Diagnostic Errors; D006801:Humans; D008297:Male; D008875:Middle Aged; D012886:Skull / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed; D000159:Vestibulocochlear Nerve / Q000000981:diagnostic imaging*