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Selective Fascicular Involvement of the Median Nerve Trunk Causing Pseudo-Anterior Interosseous Nerve Syndrome: Ultrasound and MR Imaging Features

Yonsei Medical Journal 2020년 61권 6호 p.547 ~ 552
정윤영 ( Jung Yoon-Young ) - Eulji University Nowon Eulji Medical Center Department of Radiology

최윤선 ( Choi Yun-Sun ) - Eulji University Nowon Eulji Medical Center Department of Radiology
이창훈 ( Lee Chang-Hun ) - Eulji University Nowon Eulji Medical Center Department of Orthopedic Surgery
권오윤 ( Kwon Oh-Yun ) - Eulji University Nowon Eulji Medical Center Department of Neurology
김민철 ( Kim Min-Chul ) - Eulji University Nowon Eulji Medical Center Department of Radiology

Abstract


Fascicular involvement of the median nerve trunk in the upper arm is uncommon in cases of peripheral neuropathy, and its symptoms are consistent with those of anterior interosseous nerve (AIN) syndrome. We report three cases of focal anterior interosseous fascicular involvement in the median nerve trunk presenting as AIN palsy. Our report emphasizes the unique ultrasonographic and magnetic resonance imaging (MRI) features of swelling, hourglass-like constriction and torsion, and entwinement of the nerve fascicle of the dorsal region of the median nerve, which were confirmed surgically. On MRI, all patients showed denervation changes in the AIN territory, as well as in the median nerve territory, without compressing structures.

키워드

Anterior interosseous nerve syndrome; median nerve; hourglass-like constriction; fascicular torsion, ultrasonography; magnetic resonance imaging
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