Parsonage-Turner Syndrome Following COVID-19 Vaccination: MR Neurography.

Vaccination is one of the several known triggers of Parsonage-Turner syndrome (PTS). This report describes 2 individuals with clinical presentations of PTS whose symptoms began 13 hours and 18 days following receipt of the Pfizer-BioNTech BNT162b2 and Moderna mRNA-1273 COVID-19 vaccine, respectively. The diagnosis of PTS was confirmed using both electrodiagnostic testing and 3 Tesla magnetic resonance (MR) neurography. While research is needed to understand the association between PTS and COVID-19 vaccination, MR neurography may be used to confirm suspected cases of PTS as COVID-19 vaccines continue to be distributed worldwide.