Cutaneous appendageal carcinomas—tumors of the skin appendages such as hair, nails, sweat glands and mammary glands—are rare but rates appear to be increasing in the United States, according to a report in the June issue of Archives of Dermatology, one of the JAMA/Archives journals.
"Cutaneous appendageal carcinomas are a rare and diverse group of complex neoplasms with diverse differentiation that frequently present a diagnostic challenge," the authors write as background information in the article. Because of their rarity, studies of these cancers have been limited.