Aneurysmal bone cyst, left shoulder

This code signifies an aneurysmal bone cyst (ABC) affecting the left shoulder. An ABC is a benign, expansile, osteolytic bone lesion characterized by blood-filled spaces separated by fibrous septa. It typically presents as a rapidly growing mass causing pain and swelling.

This code is used when documentation confirms a diagnosis of an aneurysmal bone cyst located specifically in the left shoulder region. This includes the humerus, scapula, or clavicle if the cyst is within the shoulder joint complex. Supporting documentation would include imaging reports (X-ray, MRI, CT) and potentially biopsy results confirming the ABC diagnosis and its precise location.

• Ensure the laterality (left) and anatomical site (shoulder) are clearly documented.
• Distinguish from other benign bone tumors or cysts; definitive diagnosis often requires histology.
• Consider additional codes for associated pathological fractures if present.