From the case:
Ulnomeniscal homologue (diagram)
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T = triquetrum, L = lunatum, H = hamatum, R = radius, U = ulna, 1 = ECU tendon and sheath, 2 = ulnar carpal collateral ligament, 3= ulnomeniscal homologue (UMH), 4 = triangular fibrocartilage complex (TFCC), Arrow = prestyloid recess.