system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
A concerned father brings his 2 year-old son to the clinic for evaluation. In the past 24 hours, the child has had multiple episodes of painless bloody stools. On physical examination, the child's vital signs are within normal limits. There is mild generalized discomfort on palpation of the abdomen but no rebound or guarding. A technetium-99m (99mTc) pertechnetate scan indicates increased activity in two locations within the abdomen. Cells originating in which organ account for the increased radionucleotide activity?
assistant
Stomach