Risk Factors for Acute Hemorrhagic Rectal Ulcer Syndrome and Its Prognosis: A Density Case-Control Study

Figure 2

Pie chart depicting the location of rectal ulcer in 30 of 38 patients with acute hemorrhagic rectal ulcer syndrome (in 8 cases, rectal ulcer location was not described in endoscopy report). Rs: rectosigmoid; Ra: rectum above the peritoneal reflection; Rb: rectum below the peritoneal reflection.