Monostotic fibrous dysplasia occurs with equal frequency in both sexes and normally develops early in life, with lesions frequently identified late in the first and early second decades.

Most patients are asymptomatic, with the diagnosis often established after an incidental finding or with pain, swelling, or fracture.

[5] Monostotic fibrous dysplasia does not convert into the polyostotic type.

When symptoms are present, they often are nonspecific, including pain, swelling, or pathologic fracture.

[6] It most often affects the ribs (28%), proximal femur (23%), tibia, craniofacial bones (10-25%) and humerus (10-25%).