What diagnosis is indicated by a CT showing restricted opening of 5mm with a benign condylar growth?

• A. Temporomandibular Joint Disorder
• B. Bony Ankylosis
• C. Osteitis Condensans
• D. Fibrous Dysplasia

Answer: (B)

The diagnosis indicated by a CT scan showing a restricted opening of 5mm in conjunction with a benign condylar growth most accurately points to bony ankylosis. In bony ankylosis, a fusion occurs between the condyle of the mandible and the glenoid fossa of the temporal bone, resulting in a significant reduction of the available range of motion of the jaw. The presence of a benign condylar growth in this context suggests that the growth could be contributing to the fusion or is associated with the restrictive movement seen in ankylosis.

The characteristic that stands out in this diagnosis is the severe limitation of mandibular movement (restricted opening). A 5mm opening indicates a significantly compromised functional capacity of the temporomandibular joint, which is a hallmark of bony ankylosis. The imaging findings consistent with this condition would reveal more than just soft tissue changes; they would highlight osseous alterations leading to the fusion of the joint surfaces.

Other potential diagnoses, while related to joint and bone conditions, do not fit as well with the specific combination of restricted jaw movement and the presence of a benign condylar growth. For instance, temporomandibular joint disorder could lead to restricted movement as well,