title: Clear cell atypical fibroxanthoma - report of a case with review of the literature.
abstract: Clear cell atypical fibroxanthoma (CCAFX) is a rare variant of atypical fibroxanthoma (AFX), a pleomorphic dermal tumour associated with a good prognosis. A 67-year-old man presented with a rapidly growing nodule on the ear, which had appeared over a 2-week period. Sections showed an ulcerated nodule composed of pleomorphic spindled and polygonal cells with clear cytoplasm, invested by a delicate vascular stroma, reminiscent of clear cell renal cell carcinoma. Numerous mitotic figures were seen. The tumour cells stained with vimentin, CD68 and CD99 and were cytokeratin-negative. The immunohistochemical and ultrastructural features supported a diagnosis of CCAFX. The diagnosis of CCAFX requires the exclusion of other pleomorphic clear cell tumours that can occur in the skin by using a combination of morphology, immunohistochemistry and electronmicroscopy. Murali R, Palfreeman S. Clear cell atypical fibroxanthoma - report of a case with review of the literature.
authors.affiliation: Department of Histopathology, Douglass Hanly Moir Laboratories, North Ryde, NSW, Australia.
authors.forename: Rajmohan
authors.initials: R
authors.lastname: Murali
authors.forename: Simon
authors.initials: S
authors.lastname: Palfreeman
mesh_terms: D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis; D004423:Ear / Q000473:pathology; D018219:Histiocytoma, Benign Fibrous / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D046529:Microscopy, Electron, Transmission; D012878:Skin Neoplasms / Q000378:metabolism / Q000473:pathology*
chemical_list: D014408:Biomarkers, Tumor