We report a case of levator claviculae muscle presenting clinically as a hard mass in the clavicular area due to angular deformity of this bone. To our knowledge, this is the first report where the anomalous muscle shows this clinical presentation.

We present a case of forearm soft tissue mass caused by an accessory muscle, distal and deep to flexor carpi ulnaris muscle. Imaging studies, mainly magnetic resonance and ultrasound, allow a specific diagnosis, and obviate unnecessary surgery. In this case, the symptoms associated with ulnar compression led to surgery and confirmed the preoperative diagnosis.

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