Parasagittal solitary fibrous tumor resembling hemangiopericytoma.
Solitary fibrous tumor (SFT) is a rare mesenchymal tumor in the central nervous system, and the clinical behavior of this tumor is similar to that of meningioma. We report the case of a Japanese woman with parasagittal SFT that resembled hemangiopericytoma (HPC). Histological examination revealed that the tumor was highly cellular, with cells containing oval- or spindle-shaped nuclei arranged in sheets or a pattern-less growth mode. Focal vascular proliferation was also observed. Some areas showed intercellular stroma containing remarkable eosinophilic collagens. Tumor cells showed a strong immunoreactivity for CD34 but were negative for S-100 protein and epithelial membrane antigen. MIB-1 labeling index of the tumor was 6.6%. Owing to the high cellularity, high MIB-1 labeling index, and focal vascular proliferation, it was difficult to distinguish this lesion from HPC. However, the tumor was finally diagnosed as SFT on the basis of the strong immunostaining for CD34 and absence of pericellular reticulin.
Shidoh
Satoka
S
Department of Neurosurgery, Keio University Hospital, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan. blsk_sl_satok@yahoo.co.jp
Yoshida
Kazunari
K
Takahashi
Satoshi
S
Mikami
Shuji
S
Mukai
Makio
M
Kawase
Takeshi
T
D018952:Antigens, CD34 / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis; D001932:Brain Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006393:Hemangiopericytoma; D006423:Hemianopsia / Q000209:etiology; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D054364:Solitary Fibrous Tumors / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D013194:Staining and Labeling
D018952:Antigens, CD34; D014408:Biomarkers, Tumor; D019394:Ki-67 Antigen