‘Bear-Claw’ appearance on CECT abdomen is seen in:
**Core Concept**
The 'Bear-Claw' appearance on computed tomography (CT) scans, particularly on contrast-enhanced CT (CECT) of the abdomen, is a characteristic imaging finding associated with certain pathologies. This appearance is typically observed due to the irregular, branching, or aneurysmal dilatation of visceral or mesenteric arteries, which can be seen in conditions such as abdominal aortic aneurysms (AAAs), vasculitis, or atherosclerosis.
**Why the Correct Answer is Right**
The 'Bear-Claw' sign is thought to be caused by the irregular, branching vascular channels that resemble the claws of a bear. This sign is often seen in the setting of aortic dissection or aneurysm, where the aortic wall is compromised, leading to the formation of false lumens and irregular vascular channels. The presence of the 'Bear-Claw' sign can indicate a high risk of rupture or other complications.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the 'Bear-Claw' sign is not typically associated with conditions such as pancreatic cancer, which may present with different imaging characteristics, such as a mass or ductal dilatation.
**Option B:** This option is incorrect because the 'Bear-Claw' sign is not typically seen in conditions such as liver cirrhosis, which may present with different imaging characteristics, such as liver nodularity or ascites.
**Option C:** This option is incorrect because the 'Bear-Claw' sign is not typically associated with conditions such as splenic artery aneurysm, which may present with different imaging characteristics, such as a focal aneurysmal dilatation.
**Clinical Pearl / High-Yield Fact**
The 'Bear-Claw' sign is a high-yield imaging finding that requires immediate recognition and further evaluation, as it may indicate a high-risk condition such as aortic dissection or aneurysm. It is essential to remember that this sign can be associated with a high risk of rupture or other complications, necessitating prompt medical attention.
**Correct Answer:** D.