Parsonage-Turner syndrome is an acute idiopathic brachial neuritis. It is twice as common in men than women 1.
Almost all cases involve the suprascapular nerve with nearly 50% of the cases solely affecting it. One-third of the case are bilateral 2.
The aetiology of Parsonage-Turner syndrome is unclear; however, few predisposing factors are suggested such as minor trauma, surgery, gunshot wounds and infections 3,4.
On MRI shoulder, muscles initially look normal, but over the next few weeks, muscular denervation changes appear as high T2 signal, as in the current case. Later on, atrophy and fatty infiltration well develop with reduced muscle bulk and increased T1 signal.
The condition usually responds to conservative treatment 2.
Case submitted by Dr Abeer Ahmed Alhelali and Dr Mohamed Ashfaque Kukkady.