Extradigital glomus tumor in the knee: excision with ultrasound guided needle localization.

Glomus tumors are rare neoplasms that are usually subungual in location, but can infrequently be found elsewhere in the body. When they occur in extradigital locations, they present a diagnostic challenge that may result in delay of definitive management. We report a case of a 51-year-old male who experienced decade long chronic pain because of a glomus tumor in the suprapatellar fat pad of the knee. This case is unique not only because of the glomus tumor's location, but also because it ultimately required ultrasound-guided needle localization for excision.