Extradigital Glomus Tumor—a Rare Cause for Undiagnosed Chronic Pain in Unusal Sites

Abstract

Glomus tumor is a benign vascular tumor derived from the modified smooth muscle cells of the glomus body. The single most common site is the subungual region of the finger, but other common sites include the palm, wrist, forearm, and foot. In this article, we present a rare situation of glomus tumor occurring on the back of the chest over the scapular area in an elderly male patient. The tumor cells exhibited positive expression for CD34 and smooth muscle actin. This paper highlights the fact that a glomus tumor is a benign neoplasm that may occur in multiple locations. Therefore, the significance of a histological and immunohistochemical approach for a correct characterization of this lesion is required.