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Table 1 Acute and late GI morbidity scoring system according to RTOG/EORTC scale[18]

From: Multivariate normal tissue complication probability modeling of gastrointestinal toxicity after external beam radiotherapy for localized prostate cancer

Acute morbidity
Grade I II III IV
  Increased frequency or change in quality of bowel habits not requiring medication/rectal discomfort not requiring analgesics Diarrhea requiring drugs/mucous discharge not necessitating sanitary pads/rectal or abdominal pain requiring analgesics Diarrhea requiring parenteral support/severe mucous or blood discharge necessitating sanitary pads/abdominal distention Acute or subacute obstruction, fistula or perforation; GI bleeding requiring transfusion; abdominal pain or tenesmus
Late morbidity
Grade I II III IV
  Mild diarrhea; mild cramping Moderate diarrhea and colic Obstruction or bleeding requiring surgery Necrosis/Perforation
  Bowel movements 5 times daily Bowel movements >5 times daily   Fistula
  Slight rectal discharge or bleeding Excessive rectal mucus or intermittent bleeding