title: Ependymoma with signet-ring cells.
abstract: Two patients presented with unusual primary brain tumors having abundant signet-ring cells, for which electron microscopic study was necessary to establish the diagnosis of ependymoma. The light and electron microscopic features of these tumors are discussed, with brief comments on the differential diagnosis.
authors.affiliation: Department of Surgical Pathology, Loma Linda University Medical Center, California 92354.
authors.forename: C W
authors.initials: CW
authors.lastname: Zuppan
authors.forename: G W
authors.initials: GW
authors.lastname: Mierau
authors.forename: D A
authors.initials: DA
authors.lastname: Weeks
mesh_terms: D000328:Adult; D001932:Brain Neoplasms / Q000648:ultrastructure*; D018279:Carcinoma, Signet Ring Cell / Q000648:ultrastructure*; D002648:Child; D003937:Diagnosis, Differential; D004806:Ependymoma / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D008854:Microscopy, Electron