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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
Also, they determined that when the spleen reached or extended below the lower third of the left kidney, this was highly specific for splenomegaly despite a low sensitivity (sensitivity 20%, specificity 93%). The study validated the use of a simple splenic length measurement for splenic CT volume. When splenic length exceeds 10 cm, a diagnosis of splenomegaly should be made. This clinically practical, accurate, simple measurement replaces multiple-measurement, time-consuming methods, and allows daily routine follow-up, the authors reported.