An 18-year-old man with a history of well-controlled type 1 diabetes was referred to the emergency department from a local student health center with several days of leg pain and concern about a possible retained foreign body. His diabetes was managed with an insulin pump interfaced with a Dexcom G6 continuous glucose monitoring (CGM) system. The patient noted that ∼1 week earlier, he was changing his CGM sensor when a small piece of the sensor wire broke and was retained in his right anterior thigh. He was asymptomatic for several days and then noticed some minor throbbing discomfort in the anterior thigh at the site of the retained wire. The pain was exacerbated with prolonged exercise, specifically running, which prompted his presentation.

Exam of the leg was unremarkable. There was no sign of puncture or trauma, a foreign body was not palpable on exam, there was no erythema or swelling,...

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