Male, 4 years old. Gunshot wound through left arm with wrist drop concerning for biceps tear or nerve damage. A linear area of fluid signal corresponding with the bullet tract courses through the distal upper arm soft tissues, tracking through the volar skin and subcutaneous soft tissues, the flexor compartment musculature including the biceps brachii and brachioradialis muscle bodies, lateral to the distal humerus, through the long head of the triceps muscle, and through the dorsolateral subcutaneous tissues.The tendons appear normal without evidence of rupture. No discrete fluid collection is identified.The underlying osseous structures are normal.
The bullet tract traverses multiple muscles as detailed above. No tendon rupture, fracture, or fluid collection.