A 45-year-old woman presented with a 6-month history of a small nodule with intermittent sharp pain in the right palm. There was no history of trauma or infection in the area. She had worked in an electronic company for several years, and the sharp pain usually occurred when grasping and moving the hard cases of electric home appliances. No visible mass or skin changes were evident over the affected area, but a firm 0.5 cm sized nodule was palpated 2.5 cm proximal to the metacarpophalangeal joint of the index finger. The nodule was mobile and Tinel's sign was positive on percussion. Plain radiographs were unremarkable, but MRI revealed a subcutaneous, well-defined 5x10 mm ovoid mass, superficial to the flexor tendon sheath and lumbrical muscles at the metacarpal neck level (Figure 1).
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