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The serratus anterior is a flattened sheet of muscle originating from the first through the ninth ribs and inserting along the medial border of the costal surface of scapula. The function of serratus anterior is to protract and rotate the scapula, thus providing a full range of motion at glenohumeral joint. It also keeps the scapula closely opposed to the thoracic wall (1, 2). Only a few cases of isolated aplasia of the serratus anterior muscle have been reported (2, 3). Usually, it presents as a part of the combination of shoulder girdle muscle anomalies (4-6). Here, we report a case of a 30-year-old male with unilateral complete aplasia of the right serratus anterior muscle and winging of the right scapula, which was incidentally found through chest radiography and CT scan. This unusual case emphasizes the importance of paying careful attention to chest wall structures while interpreting a plain radiography.

Incidental Finding of Unilateral Isolated Aplasia of Serratus Anterior Muscle and Winged Scapula on Chest Radiograph: A Case Report