Real case during my training years-
40 yo F, hx of seronegative spondyloarthro pathy, previously on Enbrel, presents to the ER with a complaint of abdominal pain and SOB. On examination, abdomen was distended with diffuse petechiae. She complains of a burning like sensation to the skin. Pain is 10/10. Non radiating. Vitals: 95/76, 124, 20, 98.0, 99% O2sat on RA. Lab show leukocytosis, and anemia. Ct of the chest showed bilateral diffuse nodular opacity. Ct of the abdomen suggested constipation vs ileus.
What are your ddx? Or other questions that may help u narrow ur ddx?