Brachialis muscle metastasis: An unusual, presenting site of metastatic adenocarcinoma of the colon.

Skeletal muscle metastasis from gastrointestinal system tumours is extremely rare. We report an unusual presentation of skeletal muscle metastasis in the brachialis muscle as a presenting feature of a previously undiagnosed colonic adenocarcinoma in a 66-year-old male. He presented to us with a painful, flexion deformity of his elbow and suspected to have a biceps brachii rupture. We review the clinico-radiological findings and the relevant literature. This case-report highlights the importance of a thorough clinical evaluation especially in presence of red flag signs, early multi-disciplinary team (MDT) discussion and biopsy to formulate a plan of management.