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There is a 12x16x17 mm mass lesion located in the quadrilateral space. The signal characteristics are as follows: iso signal on T1W images, heterogenous signal on PD images, water signal in fluid sensitive images.
Note the increased signal in T2 fat suppressed sequence within the teres minor and deltoid muscles that is consistent with acute oedema due to acute muscle denervation. Minor volume loss and fatty change however noted in the left deltoid muscle.