Oncogenic osteomalacia (OO) is a rare paraneoplastic syndrome of osteomalacia due to
phosphate wasting. The phosphaturic mesenchymal tumor (mixed connective tissue variant)(…

… Eduardo Calonje, along with co-editors Thomas Brenn, and Alexander Lazar, and new co-editor
Steven D. Billings who offers expertise on both dermatopathology and soft tissue tumors…

Cyclooxygenase-2 (COX-2) expression is up-regulated in several types of human cancers
and has also been directly linked to carcinogenesis. To investigate the role of COX-2 in …

We are reporting seven histologically identical cases of a distinctive, low-grade vascular
tumor that closely mimics an epithelioid sarcoma because of growth in solid sheets and nests, …

Iatrogenic angiosarcomas (AS), following treatment of breast carcinomas and attributed to
chronic lymphedema, were first described by Stewart and Treves. With emphasis on breast-…

There is a prevailing view that leiomyomas of deep soft tissue are rare or nonexistent, but
there are limited data on this subject in the form of large clinical studies with long follow-up …

Low-grade fibromyxoid sarcoma (LGFMS), usually a deeply situated mass in adults, is
uncommon in superficial soft tissue and in children. Nineteen superficial LGFMS from our files …

Dermatofibrosarcoma protuberans (DFSP) is a slow growing, low- to intermediate-grade
dermal soft-tissue tumor. It has a high local recurrence rate but low metastatic potential. It is …

Phosphaturic mesenchymal tumors typically cause paraneoplastic osteomalacia, chiefly as
a result of FGF23 secretion. In a prior study, we identified FN1–FGFR1 fusion in 9 of 15 …

Perineuriomas are rare benign soft tissue tumors having an immunophenotype paralleling
the normal perineurial cell [S-100 protein negative and epithelial membrane antigen (EMA) …