case_images: PMC11818228_01
case_images: Anterior interosseous nerve:electroneurography images recorded: (a) left limb before surgery on 20 February 2024, (b) right limb on 20 February 2024, (c) left limb after surgery on 11 March 2024:with the improvement of the amplitude.
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case_images: However, the ENG revealed a notable reduction in the amplitude of the left anterior interosseous nerve (recorded from the flexor pollicis longus muscle, according to Felice's method when compared to the asymptomatic side (Figure 1)).
case_images: An ultrasound image of the massive compression of the median nerve (1) between the heads of the pronator teres muscle (A) with the swelling of the nerve at the level of the lacertus fibrosus (B). Postoperative evaluation reveals a normal median nerve both at the site of the previously noted compression (C) and in the ulnar fossa (D). Images were obtained with the D7L40L linear probe of the Chison CBit4.
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case_images: A comparative evaluation was performed with the contralateral asymptomatic side, where no features of compression in the pronator teres muscle and edema in the ulnar fossa were visualized (Figure 2).
case_images: Marked surgical access.
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case_images: The mini-open surgical procedure was conducted with the skin incision made medial to the biceps tendon (Figure 3).
case_images: Lacertus fibrosis intraoperation photography.
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case_images: The pronator teres muscle was mobilized and the lacertus fibrosis was intersected under direct visualization (Figure 4).