A case report of an elderly man in his 80s presenting with a rapidly enlarging, erythematous, telangiectatic, firm plaque on the forearm, evaluated by histopathologic examination revealing a highly cellular dermal spindle-cell neoplasm.
Histopathology demonstrated a dermal-based, highly cellular spindle-cell proliferation; the case is framed as a diagnostic challenge ('What is your diagnosis?'), with no explicit final diagnosis stated in the abstract.
Single case report with minimal clinical and histopathologic detail available in the abstract; final diagnosis, treatment, and outcome are not disclosed in the provided text.
A rapidly enlarging, firm, erythematous plaque with telangiectasias in an older patient warrants prompt biopsy, as a spindle-cell dermal neoplasm (e.g., dermatofibrosarcoma protuberans, atypical fibroxanthoma, or other sarcomatoid entity) must be excluded.
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