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. 2021 Aug 17;302(1):84–87. doi: 10.1148/radiol.2021211374

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2021 by the Radiological Society of North America, Inc.

This article is made available via the PMC Open Access Subset for unrestricted re-use and analyses in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the COVID-19 pandemic or until permissions are revoked in writing. Upon expiration of these permissions, PMC is granted a perpetual license to make this article available via PMC and Europe PMC, consistent with existing copyright protections.

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Patient 1: A 49-year-old man with Parsonage-Turner syndrome that developed 13 hours following the first dose of the Pfizer-BioNTech (BNT162b2) COVID-19 vaccine. (A) Axial T2-weighted fast-spin echo fat-suppressed image 8 weeks after symptom onset demonstrates denervation edema pattern of the pronator teres (PT) and flexor carpi radialis (FCR) muscles. (B) Axial T2-weighted gradient-echo image demonstrates abnormal signal hyperintensity of the PT/FCR, anteromedially positioned, fascicular bundle (arrow, magnified inset) of the median nerve (oval) within the distal arm. (C) Oblique sagittal curved multiplanar reformatted T2-weighted gradient-echo image demonstrates multiple severe intrinsic constrictions (arrows) of the PT/FCR bundle of the median nerve (bracket). — Patient 1: A 49-year-old man with Parsonage-Turner syndrome that developed 13 hours following the first dose of the Pfizer-BioNTech (BNT162b2) COVID-19 vaccine. (A) Axial T2-weighted fast-spin echo fat-suppressed image 8 weeks after symptom onset demonstrates denervation edema pattern of the pronator teres (PT) and flexor carpi radialis (FCR) muscles. (B) Axial T2-weighted gradient-echo image demonstrates abnormal signal hyperintensity of the PT/FCR, anteromedially positioned, fascicular bundle (arrow, magnified inset) of the median nerve (oval) within the distal arm. (C) Oblique sagittal curved multiplanar reformatted T2-weighted gradient-echo image demonstrates multiple severe intrinsic constrictions (arrows) of the PT/FCR bundle of the median nerve (bracket).