Inflammatory pseudotumour or retractile mesenteritis.
D000293:Adolescent; D003937:Diagnosis, Differential; D005350:Fibroma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008643:Mesentery; D010538:Peritonitis / Q000175:diagnosis*; D012186:Retroperitoneal Neoplasms / Q000175:diagnosis*