title: Composite dermatofibrosarcoma protuberans-giant cell fibroblastoma recurring as Bednár tumor-giant cell fibroblastoma with mucoid lakes and with amputation neuroma.
abstract: We report an unusual case of composite giant cell fibroblastoma-dermatofibrosarcoma protuberans (DFSP) that, in its second recurrence, contained a pattern of Bednár tumor (BT) and giant cell fibroblastoma (GCF). The recurrent tumor showed extreme myxoid change with creation of mucoid lakes, which mimicked a pattern of myxoid liposarcoma. One area in the recurrent lesion contained amputation neuroma overgrown with neoplastic spindle cells, which simulated a nerve sheath neoplasm. This case demonstrates common histogenesis of GCF, DFSP and BT, and it shows how broad morphological spectrum can be produced by a composite tumor, especially when the tumor includes unconventional growth pattern or additional non-neoplastic lesion.
authors.affiliation: Sikl's Department of Pathology, Faculty Hospital, Charles University, Plzen, Czech Republic. zamecnik@medima.cz
authors.forename: M
authors.initials: M
authors.lastname: Zámecník
authors.forename: M
authors.initials: M
authors.lastname: Michal
authors.forename: A
authors.initials: A
authors.lastname: Chlumská
mesh_terms: D018223:Dermatofibrosarcoma / Q000473:pathology*; D005870:Giant Cell Tumors / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000473:pathology*; D018317:Nerve Sheath Neoplasms / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*