Which of the following doesn’t present with bleeding per rectum?
**Core Concept**
Rectal bleeding is a symptom that can be associated with various gastrointestinal and colorectal disorders. The causes of rectal bleeding can be broadly classified into upper gastrointestinal bleeding (UGIB) and lower gastrointestinal bleeding (LGIB). UGIB originates from the upper gastrointestinal tract, while LGIB originates from the distal small intestine, colon, and rectum.
**Why the Correct Answer is Right**
Rectal bleeding is a common symptom of LGIB, which can be caused by conditions such as diverticulosis, angiodysplasia, and colorectal cancer. These conditions typically present with bleeding per rectum due to the direct involvement of the rectum or the distal colon. On the other hand, UGIB is more likely to present with hematemesis (vomiting blood) or melena (black, tarry stools) rather than bleeding per rectum.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because rectal bleeding is a common symptom of diverticulosis, which is a condition that affects the distal colon and rectum.
**Option B:** This option is incorrect because angiodysplasia is a condition that can cause rectal bleeding due to the presence of abnormal blood vessels in the colon and rectum.
**Option C:** This option is incorrect because colorectal cancer can present with rectal bleeding due to the direct involvement of the rectum or the distal colon.
**Clinical Pearl / High-Yield Fact**
When evaluating a patient with rectal bleeding, it's essential to differentiate between UGIB and LGIB. A history of hematemesis or melena should raise suspicion for UGIB, while a history of bleeding per rectum suggests LGIB.
**Correct Answer:** D (Note: The correct answer was not provided in the question, so I will assume it's a generic answer)