title: Fibro-osseous pseudotumor of the digits arising in the subungual region: a rare benign lesion simulating extraskeletal osteosarcoma.
abstract: A rare case of subungual fibro-osseous pseudotumor of the digits in a 59 year old woman is reported. A painful polypoid mass with ulcerative changes was noted in the subungual portion of the right first toe. Macroscopically, the tumor arose chiefly in the subcutaneous region and was unrelated to the underlying bone tissue. Histologically, the lesion contained fibroblast-like tumor cells producing an extensive osteoid substance in a granulation-like background. Although it was necessary to distinguish the lesion from extraskeletal osteosarcoma, the tumor cells lacked prominent atypical features. It is considered that pathologists and clinicians should add fibro-osseous pseudotumor of the digits to the differential diagnosis of subungual tumor.
authors.affiliation: Department of Clinical Laboratory Medicine, Faculty of Medicine, Tottori University, Yonago, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Horie
authors.forename: T
authors.initials: T
authors.lastname: Morimura
mesh_terms: D003937:Diagnosis, Differential; D005260:Female; D005534:Foot Diseases / Q000175:diagnosis / Q000473:pathology*; D006801:Humans; D008875:Middle Aged; D009221:Myositis Ossificans / Q000175:diagnosis / Q000473:pathology*; D012516:Osteosarcoma / Q000175:diagnosis; D014034:Toes / Q000473:pathology*; D014456:Ulcer / Q000473:pathology