“…Polyostotic disease often affects the craniofacial bones 1. Spinal involvement is observed in 1.4% to 5.5% of fibrous dysplasia cases, and polyostotic fibrous dysplasia in the spine is uncommon, with fewer than 40 documented cases in the literature 2–6. This report aims to present a case involving isolated polyostotic fibrous dysplasia in the spine and ribs with cystic components.…”