What diagnosis due you suspect?
There is fat stranding in the right lower quadrant but the abdominal viscera are unremarkable - this raises omental infarction as the likely diagnosis.
Where is the most common location for omental infarction?
As in this case, the right lower quadrant.
Inflammatory stranding of omental fat anterior to the right colon containing a whirling pattern of vessels is consistent with omental infarct.
Stranding is distant to the appendix, which has diameter 6mm. No mural thickening in adjacent colon. No bowel obstruction. No free intraperitoneal fluid or gas. No enlarged retroperitoneal or mesenteric lymph nodes.
Multiple calcified gallstones.
Umbilical hernia with a broad hernial orifice and contains fat and bowel without incarceration or obstruction.
Conclusion
Pattern and location of inflammatory stranding is consistent with omental infarct.