• Richard E Scalf, Doris E Wenger, Matthew A Frick, Jayawant N Mandrekar, and Mark C Adkins.
• Department of Radiology, Mayo Clinic, 200 First St., SW, Rochester, MN 55905, USA.
• AJR Am J Roentgenol. 2007 Jul 1;189(1):W39-44.

ObjectiveThe objective of our study was to describe the MRI features of patients with Parsonage-Turner syndrome. Familiarity with the MRI features associated with this entity is important because radiologists may be the first to suggest the diagnosis. Twenty-six patients with Parsonage-Turner syndrome were treated at our institution between 1997 and 2005. We retrospectively reviewed the MR images of patients with clinical or electromyographic evidence (or both) of acute brachial neuritis without a definable cause.ConclusionMRI of the brachial plexus and shoulder in patients with Parsonage-Turner syndrome showed intramuscular denervation changes involving one or more muscle groups of the shoulder girdle. The supraspinatus and infraspinatus muscles were the most commonly involved. MRI is sensitive for detecting signal abnormalities in the muscles of the shoulder girdle of patients with Parsonage-Turner syndrome. MRI may be instrumental in accurately diagnosing the syndrome.

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