Voissius ring is seen in the –
**Core Concept**
The Voissius ring, also known as the Voissius annulus, is a radiographic sign associated with a specific type of aortic dissection. It represents a ring-like or semicircular calcification at the aortic root level, which is indicative of chronic aortic dissection.
**Why the Correct Answer is Right**
The Voissius ring is formed due to the calcification of the aortic media, which is a result of the dissection process. In aortic dissection, the intimal tear allows blood to flow between the layers of the aortic wall, leading to a disruption of the media layer and subsequent calcification. The calcified ring is visible on plain radiographs or CT scans and is often associated with chronic aortic dissection.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because Voissius ring is not typically associated with aortic aneurysm, although both conditions can involve the aorta.
* **Option B:** This option is incorrect because Voissius ring is not a characteristic feature of cardiac tamponade, which is a condition where fluid accumulates in the pericardial space and compresses the heart.
* **Option C:** This option is incorrect because Voissius ring is not a specific sign of pulmonary embolism, which is a condition where a blood clot lodges in the pulmonary arteries.
**Clinical Pearl / High-Yield Fact**
The Voissius ring is a classic radiographic sign of chronic aortic dissection, and its presence should prompt further evaluation, including imaging studies and possibly surgical consultation.
**Correct Answer: A. Aortic dissection**