Primary Low-Grade Neuroendocrine Carcinoma of the Skin: An Exceedingly Rare Entity

Abstract

Low-grade neuroendocrine tumors (NET), also known as carcinoid tumor, commonly arise from the gastrointestinal and pulmonary tracts, but rarely occur in the skin. Cutaneous NET typically occurs as metastases or high grade primary lesions, called Merkel cell carcinoma. In the few cases described in literature, primary low-grade neuroendocrine carcinomas of the skin (LGNECS) are usually indolent cutaneous nodules, presenting on the head and trunk of elderly patients. LGNECS tumors are histologically similar to its counterparts arising in other anatomic locations. Since there is no NET cut-off for the skin due to their rarity, the gastrointestinal scale was used instead; low grade NETs have a Ki-67 proliferative index of less than 3%. The distinction between primary and metastatic NET, however, is not absolute and can be difficult. A primary versus metastatic NET diagnosis relies on clinical exclusion of a NET in other, more common, anatomic locations. Here, we present a case of an LGNECS on the scalp of a 72-year-old female patient. Whole body imaging failed to identify any octreotide-avid lesions elsewhere in the patient, aside from two positive cervical lymph nodes, which were confirmed with a node dissection and histologic evaluation. This is the nineteenth reported case of LGNECS and the 2nd reported case of LGNECS with nodal metastasis.

from #ORL-AlexandrosSfakianakis via ola Kala on Inoreader http://ift.tt/2i405VI