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Notable Notes
January 2010

Cock's Peculiar Tumor

Arch Dermatol. 2010;146(1):68. doi:10.1001/archdermatol.2009.301

A 79-year-old woman with a giant, cystic lesion of the scalp stated that a smaller nodule that had been at the site for 60 years had suddenly enlarged over the preceding 2 months (Figure). An excisional biopsy specimen showed the histologic features of a proliferating pilar cyst, also known as Cock's peculiar tumor. So who was Cock? And are we any wiser as to the nature of the entity that he first described in 1852?1

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