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Image A demonstrates the pathological side. Here the nerve appears swollen and deviates sharply as it enters the Arcade of Frohse (thin arrow). There is a wedge-shaped scar superficial to it, which appears to alter the course of the nerve.
Image B: normal appearance of PIN, gradual change in its course and absence of the echogenic scar in the contralateral side.
On the pathological side, there was point tenderness at the arcade with pain occasionally radiating down the forearm. These symptoms could not be reproduced on the contralateral side.
The overall impression was of PIN entrapment at the arcade of Frohse.