An 18 month old boy presents soon after passing a large amount of dark red blood per rectum. During the preceding 2 days, he had passed dark red, jelly like stools several times. No other symptoms were present apart from the fact that he had been lethargic for the past 24 hrs. His birth, medical and family histories are unremarkable.
WBC: 7,000/mm3 Hb: 9.6 g/dl (low) Hct: 31% Plt: 320,000/mm3
INR: 1.0 (normal) APTT: 30 sec (normal) TT: 12 sec (normal)
A large amount of altered blood is present the colon, preventing proper visualization of the colonic walls.
An area of focal uptake is seen in the right lower quadrant of the abdomen. This focus appears at the same time as gastric activity, and its intensity increases in parallel with gastric activity.