Presentation
Acute right loin pain to groin pain.
Patient Data
Note is made of a small stone at the distal right ureter causing mild hydroureteronephrosis.
Incidental finding of stranding and swollen mesentery containing multiple tissue nodules, with preserved fat around the mesenteric vessels and the soft tissue nodules.
Surrounding each nodules and vessels, but better seen around some, is a ring of un-stranded fat, the so called fat halo or fat ring sign (yellow dotted line).
Distal right ureteric stone (blue arrow) is seen with proximal hydroureter.
Case Discussion
This case illustrates typical appearances of mesenteric panniculitis with an elegantly demonstrated fat halo sign.