Eccrine poroma (acrospiroma) (pink to livid red)

8.Hidradenoma papilliderum (ma be reddish brown) or Merkel’s cell car Cutaneous tumors encompass a vast array of malignancies, from neuroendocrine to lymphoid. In addition to primary malignancies, the skin can also be a major site for metastases of internal cancers. The treatment and diagnosis of many cutaneous tumors is continually changing, and the role of clinicians (eg, primary care physicians, dermatologists, plastic surgeons, pathologists) focuses on an accurate diagnosis and a thorough understanding of the clinical sequelae. In addition, these rare cutaneous tumors are often difficult to diagnose based solely on the physical examination findings, and the proper diagnosis relies on excisional biopsy with histologic studies. This article focuses mainly on nonmelanoma skin cancers, with an emphasis on rare benign and malignant epithelial, dermal, and adnexal tumors.

9.Dermal cylindroma (pink to red) Cylindromas are benign skin appendage tumors. They can be seen in conjunction with eccrine spiradenomas and trichoepitheliomas. Cases of spiradenocylindromas, demonstrating characteristics of both spiradenoma and cylindroma in the same tumor mass, have also been observed, suggesting similar derivation of both tumors.

They most commonly occur on the head and neck as solitary or multiple tumors. Solitary cylindromas occur sporadically and typically are not inherited. Multiple tumors are observed in an autosomal dominantly inherited manner. When nodules enlarge and coalesce on the scalp, they form the distinctive turban tumor feature.

Malignant cylindromas are very rare. Malignant transformation may develop within solitary cylindromas, or they may complicate the multiple variant (more common).

Date: 2015-01-11; view: 867