Pipe stern colon is seen in:
**Core Concept**
The pipestem colon, also known as the "pipestem" or "drainpipe" appearance, is a radiological finding that describes a segment of the colon with a narrowed lumen and a thickened, rigid wall. This characteristic appearance is often associated with chronic ischemic colitis, a condition caused by reduced blood flow to the colon.
**Why the Correct Answer is Right**
Chronic ischemic colitis occurs due to compromised blood flow to the colon, which can be caused by atherosclerosis, vasculitis, or embolic events. The narrowing of the lumen and thickening of the wall in the pipestem colon result from chronic inflammation and fibrosis of the colonic mucosa and submucosa. The affected segment of the colon may become rigid and lose its normal peristaltic function.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the pipestem colon is not typically associated with the colon's early response to injury, which is more characterized by edema, hemorrhage, and necrosis.
* **Option B:** This option is incorrect because the pipestem colon is not a feature of primary sclerosing cholangitis, a disease that primarily affects the bile ducts and does not typically involve the colon.
* **Option C:** This option is incorrect because the pipestem colon is not a common finding in diverticular disease, which is characterized by the formation of small pouches in the colonic wall.
**Clinical Pearl / High-Yield Fact**
The pipestem colon is often seen in patients with chronic mesenteric ischemia, a condition that can present with abdominal pain, weight loss, and changes in bowel habits. It is essential to consider this diagnosis in patients with a history of atherosclerotic disease, especially if they have symptoms of chronic intestinal ischemia.
**Correct Answer:** D.