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Fig. 3B —41-year-old man with noncommunicating tear at ulnar insertion of triangular fibrocartilage, fracture of distal radius, and avulsion of ulnar styloid process in left wrist due to fall 10 days before examination. Arthroscopy showed communicating tear of ulnar attachment triangular fibrocartilage. Proton density-weighted MR image (TR/TE, 2,430/34) (A) and T1-weighted fat-saturated coronal image (525/15) (B) show diffuse bone marrow signal alterations in distal radius and distal ulna and avulsion (arrowhead) of ulnar styloid process. Leaked contrast agent is evident in ulnar attachment (large straight arrow) of triangular fibrocartilage and in area (curved arrow) between ulnar styloid process and ulna. Fluid (small straight arrows) in radiocarpal joint was interpreted as bloody joint effusion.