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Bone hypoplasia. Hypoplasia of the hook. a Axial US and b PD axial MR image in a patient with hypoplasia of the hook of the hamate. US shows a small (black arrowhead) hook of the hamate bone (H). Note the transverse carpal ligament (white arrowheads) inserting on the tip of the hook. CT carpal tunnel. b MRI confirms the US appearance
