Radiological feature of ischemic colitis is
**Core Concept**
Ischemic colitis occurs when there is a reduction in blood flow to the colon, leading to tissue damage and inflammation. This can be due to various factors, including atherosclerosis, vasculitis, or embolic events. The radiological features of ischemic colitis are crucial for early diagnosis and management.
**Why the Correct Answer is Right**
The correct answer is **A. "Target sign"**, also known as the "target sign of ischemia". This radiological feature is characterized by a concentric ring-like appearance on imaging, representing the alternating areas of ischemic and non-ischemic bowel wall. The target sign is typically seen on CT or MRI scans and is a result of the bowel wall's attempt to compensate for the reduced blood flow by increasing the thickness of the submucosa.
**Why Each Wrong Option is Incorrect**
**Option B:** This option is incorrect as it refers to a different radiological feature, which is more commonly associated with conditions like diverticulitis or inflammatory bowel disease.
**Option C:** This option is incorrect as it refers to a feature that is more commonly associated with conditions like appendicitis or intussusception.
**Option D:** This option is incorrect as it refers to a feature that is more commonly associated with conditions like bowel obstruction or volvulus.
**Clinical Pearl / High-Yield Fact**
The target sign of ischemia is a high-yield radiological feature that should be remembered by exam candidates, as it is a key indicator of ischemic colitis. In clinical practice, early recognition of this sign is crucial for prompt management and prevention of complications.
**Correct Answer: A. Target sign**