Craniofacial fibrous dysplasia and aneurismal bone cyst in a patient with McCune-Albright syndrome. A case report and review of the literature.

McCune-Albright syndrome (MAS) is a rare heterogeneous genetic disorder that is characterized by a triad of polyostotic fibrous dysplasia (FD), café au lait spots (CAL), and multiple hyperfunctional endocrinopathies. In general, it is diagnosed clinically. From the triads, 2 of the findings are enough to make the diagnosis. Craniofacial fibrous dysplasia is a term that is used to describe the fibrous dysplasia, which was localized at the craniofacial skeleton and is common in MAS patients. Aneurysmal bone cyst (ABC) is a rare non-neoplastic bone lesion that involves mostly the long bones and vertebrae and may occur very rarely in the craniofacial bones. ABCs may occur as secondary bony pathologies in association with various benign and malignant bone tumors and with fibrous dysplasia. Secondary ABC occurring in craniofacial FD is extremely rare. We present the case of a 21-year-old patient treated at our center for a right orbital aneurysmal bone cyst associated with MAS and provide a review of the relevant literature.