This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Arthroscopy of TMJ is useful in 
Select and explain. 
A. Internal derangement, B. Fracture of condyle, C. Ankylosis, D. Hyperplasia
A: Internal derangement
Answer: A: Internal derangement 
Explanation: Soft tissues of the joint (articular disk) can be imagined with MRI or Arthrography. MRI produces superb images of the soft tissues in internal derangement of the disk. Arthrography is invasive and has the risk of infection and allergic reaction due to the contrast agent.