A 7-year-old girl sustained a radiographic appearance seemed harmless (TRASH) elbow lesion after falling from play equipment. Initial radiographs demonstrated a transolecranon fracture-dislocation. Additional injury was suspected, given valgus instability after reduction. Subsequent magnetic resonance imaging (MRI) revealed a large osteochondral coronoid fragment only partially visible on initial radiographs and computed tomography (CT). Successful outcomes were achieved by ulnar nerve decompression, open reduction, and fixation. TRASH lesions, including this osteochondral coronoid injury, may be overlooked in younger children because of an abundance of unossified cartilage. A high index of suspicion and early MRI can lead to successful diagnosis and treatment.