title: Superficial angiomyxoma of the right inguinal region: report of a case.
abstract: We report one rare case of superficial angiomyxoma of the right inguinal region, in a 67-year-old man. The tumor, measuring 4.5 x 4.0 x 3.0 cm, had a finger-like shape, was composed of a well circumscribed conglomerate of multiple myxomatous nodules and was located partially in the dermis and partially in the subcutaneous tissue. Microscopically, in contrast to previously reported cases, the tumor was composed mainly of oval plump stromal cells with an amphophilic cytoplasm. Spindle-shaped stromal cells were scattered throughout the tumor. The tumor border was not infiltrative and was well defined by thick hyalized collagen bundles. Neither hyperchromasia nor pleomorphism was apparent. No mitotic figures were detected in the specimens prepared. Small to medium-sized blood vessels showed a scattered distribution, but large vessels, seen frequently in aggressive angiomyxoma, were absent. Moreover, no plexiform capillary pattern was evident. These findings were diagnostic of superficial angiomyxoma. Although this disease entity is considered as including cutaneous focal mucinosis, follicular fibroma, trichofolliculoma and trichogenic adnexal tumor, we propose that these tumors should be excluded.
authors.affiliation: First Department of Pathology, Kochi Medical School, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nakayama
authors.forename: M
authors.initials: M
authors.lastname: Hirol
authors.forename: H
authors.initials: H
authors.lastname: Kiyoku
authors.forename: K
authors.initials: K
authors.lastname: Naruse
authors.forename: H
authors.initials: H
authors.lastname: Enzan
mesh_terms: D000368:Aged; D006801:Humans; D007264:Inguinal Canal / Q000473:pathology*; D008297:Male; D009232:Myxoma / Q000473:pathology* / Q000601:surgery