Glomus tumors.

Glomus tumors are rare vascular tumors that are found most commonly in the hand. Although the tumors are benign, they can cause intense focal pain. Patients often go undiagnosed or misdiagnosed for many years because the tumors are small, usually not palpable, and have varying presentations. A combination of magnetic resonance imaging and clinical examination is used to support the diagnosis. Surgical excision normally provides complete pain relief. An awareness of the diagnosis is critical to preventing an unnecessary delay in treatment.