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Fig. 3 —Trigger finger. Longitudinal sonogram of trigger finger at level of metacarpophalangeal (MCP) joint shows focal tenosynovitis (TS) on palmar aspect of flexor tendon (T) and thickened A1 pulley. There is hesitation of flexor tendon movement during extension. For video, see supplemental Figures S3A (normal) and S3B (trigger finger).