Figure 24b. Mesenteric lymphadenopathy in a 28-year-old man with HIV infection. The patient presented with flank pain, and the CT study was performed as a renal stone protocol with the patient prone. (a) CT image shows multiple lymph nodes scattered throughout the mesentery (arrows). (b) CT image obtained 15 months later for evaluation of abdominal pain shows that the enlarged lymph nodes have resolved.