Pseudomembranous colitis

  • Follows administration of antibiotics
  • Clindamycin, lincomycin
  • Clostridium difficile commonly seen
Abdominal radiograph
  • Abnormal in 1/3 cases
  • Colonic dilatation (32%)
  • Thumbprinting
  • Thickened haustra
  • Abnormal mucosa (18%)
  • Transverse colon is most commonly affected, whole colon often involved
CT
  • Normal in 39% cases
  • Markedly thickened mucosa
  • Edema in submucosa
  • Nodular mucosal thickening
  • Accordion sign
  • Mild pericolonic fat inflammatory change
  • Ascites in 40% cases