The limitations of preoperative grading of rectal carcinoma.
D001706:Biopsy; D002277:Carcinoma / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008207:Lymphatic Metastasis; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D012004:Rectal Neoplasms / Q000473:pathology / Q000601:surgery*; D012812:Sigmoidoscopy