Fig. 3.

Shoulder imaging of a 34 year-old female 5 days following COVID vaccine injection. (A) Axial PDFS demonstrates edema in the deltoid muscle with extension to the approximate location of the quadrilateral space (Yellow Arrows); there is also adenopathy in the axillary region (Red Arrow). (B) Coronal T2FS demonstrates axillary adenopathy (Red Arrows). (C) Coronal T2FS demonstrates prominence draining vessels and/or lymphatics extending from the deltoid inflammation to the region of the quadrilateral space (Yellow Arrows). (D) Coronal T1 images demonstrate unusual increased T1 signal in the vessels and/or lymphatics extending to the approximate region of the quadrilateral space (Yellow Arrows). Color version of figure is available online.