Clinical course of the three presented cases. The longitudinal change of the patients’ body weight (BW), abdominal X-ray findings at each time point of BW measurement, and the therapeutic regimen is shown. IPO: intestinal pseudo-obstruction; IVCY: intravenous cyclophosphamide; PCI: pneumatosis cystoides intestinalis; PSL: prednisolone; TCR: tacrolimus; TPN: total parenteral nutrition