title: Case of cystic schwannoma.
abstract: Schwannoma is a well-defined tumor arising from the nerve sheath. It may present as a solitary mass in any part of the body, but is more commonly seen in the head, neck and extremities. We describe a 32-year-old female patient with a small dermal nodule on the forehead, which was 2 cm in diameter, round and of a cystic nature. Microscopic examination revealed that it consisted of compact spindle cells arranged partly in short bundles or a fascicular pattern with outstanding cystic degeneration manifested as a large, unilocular cavity in the center of the tumor tissue. The tumor cells were positive for S-100 protein and negative for epithelial membrane antigen (EMA), while the tumor capsule was positive for EMA. There was no S-100-positive membrane-like structure lining the cyst wall.
authors.affiliation: Department of Dermatology, Seoul National University College of Medicine, Seoul, Korea.
authors.forename: Yu Sung
authors.initials: YS
authors.lastname: Choi
authors.forename: Mi Seon
authors.initials: MS
authors.lastname: Shin
authors.forename: Mi Youn
authors.initials: MY
authors.lastname: Park
authors.forename: Hyang Joon
authors.initials: HJ
authors.lastname: Park
mesh_terms: D000328:Adult; D003560:Cysts / Q000209:etiology / Q000473:pathology*; D005153:Facial Neoplasms / Q000473:pathology*; D005260:Female; D006801:Humans; D009442:Neurilemmoma / Q000473:pathology*