Nerve sheath myxoma masqueraded as intramuscular myxoma: an extremely rare tumor with unusual location - a case report and literature review.

Unlabelled: Nerve sheath myxoma (NSM) is a very rare benign nerve sheath tumor that mostly affects young adults, with a peak incidence in the 30s. Patients usually present with an asymptomatic swelling commonly affecting the dermis and subcutaneous tissues of the head, neck, and upper extremities. Lower extremities are a much rarer location, and when this occurs, the knee/pretibial region is the most common location.