Retained Continuous Glucose Monitor Sensor Wire Fragments Presenting as a Swollen Nodule of the Thigh

A 2-year-old male with genetic-negative, diazoxide-responsive hyperinsulinism presented with a knot in his left, lateral thigh. His hypoglycemia was managed with diazoxide, chlorothiazide, and monitoring via a Dexcom G6 continuous glucose monitor (CGM). X-ray showed 3 metallic wire foreign bodies, consistent with retained Dexcom sensor wires. He was referred to surgery for foreign body removal. Intraoperative fluoroscopy revealed 4 pieces of wire. Two superficial pieces were removed, but 2 small pieces deep to the fascia remained because of significant risk of injury or bleeding if removal was attempted. We present this case to increase awareness in the literature regarding retention of CGM wires. Raised nodules at sites of CGM insertion without fluctuation or erythema and persistent pain should raise suspicion for retention of sensor wires.