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Macroscopic view of the left hand showing swelling of the volar aspects of the forearm and hand.
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Her forearm were broadly distended (Fig. 1) and the circumference of the left wrist was 1.2 cm longer than that of the right wrist.
MRI showing expansion of the venous malformation in the carpal tunnel, resulting in compression of the median nerve (arrow). Left, sagittal view; right, axial view at the level of the bar in the left image.
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T2-weighted imaging and suggested that the vein had expanded from the proximal forearm to the palm (Fig. 2).
Intraoperative photograph taken with the carpal tunnel held open. showing the swollen vein (arrowhead) compressing the median nerve (arrow).
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The veins were present on the ulnar side of the median nerve (Fig. 3) and were not touched during the procedure to avoid damage.