R. Tirumalae, Inchara K. Yeliur, R. Ramesh, S. Manjunath
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Pilomatricoma with apocrine poroma: A novel cutaneous collision tumor
The term “collision tumor” implies the occurrence of two or more neoplasms in a single biopsy specimen. This is a rare feature in skin biopsies, with most of the reported combinations involving melanocytic lesions or basal cell carcinomas. Combinations of adnexal tumors are found very sporadically. We report a 67-year-old woman with a scalp nodule, clinically suspected to be verrucous carcinoma, who underwent a wide excision. Histopathology showed apocrine poroma with adjacent regressing pilomatricoma.