Findings and background: Patient presents with no acute symptoms but demonstrates a deformed chest wall with chronic history of gradual increase of shortness of breath. Multiple osseous lesions with expansile morphology found throughout the chest wall involving the ribs bilaterally following distribution characteristic of fibrous dysplasia.

Key Points: Fibrous dysplasia is a benign tumor like congenital abnormality that results in extensive osteoblastic activity resulting in replacement of normal bone with fibrous tissue. Typically, fibrous dysplasia does not require treatment. Fibrous dysplasia is typically incidentally discovered. On CT scans, fibrous dysplasia is often found to be expansile demonstrating areas of sclerosis, ground glass appearance, cystic components, and potentially endosteal scalloping.

Submitted by Dr. Saeed Rad MD to radRounds Radiology Network