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Radiographs revealed an undisplaced supracondylar fracture of the humerus, in keeping with a Gartland type I supracondylar fracture.
The fracture itself is quite subtle. In the frontal view, a thin fracture line can be seen going from the medial epicondyle to the coronoid fossa.
Moderate elbow joint effusion is noted by the sail sign and the posterior fat pad sign.