IT HAS long been taught that the dilatation and contraction of the capillaries of the skin helps to regulate the heat of the body. That there is an accessory vascular apparatus called the glomus also present is not so generally appreciated.
In 1920, Barré, a French surgeon, removed a tiny painful tumor from beneath a finger nail and gave it to P. Masson for pathologic study. In his report of this tumor in 19241 Masson gave to the world the first description of a neoplasm originating in a glomus. It was bluish red and 3 to 4 mm. in diameter and was composed of large, clear, round or polyhedral cells, which were similar to those found in the coccygeal gland or glomus. Besides these "epithelioid" cells, there were present in the tumor mass arterioles, veins, smooth muscle cells and nerve fibers. Masson was so struck by this
JACKSON H, BALKIN R. GLOMUS TUMORS (ANGIONEUROMYOMAS)A Clinical and Pathologic Report of an Unusual Case. Arch Surg. 1946;53(1):100-104. doi:10.1001/archsurg.1946.01230060102007