“Shawl” sign is seen in?
**Core Concept**
The "shawl" sign is a radiological finding that refers to a specific pattern of uptake or distribution of a substance in the body, often related to **dermatomyositis**, a type of inflammatory muscle disease. It is characterized by **edema** and **inflammation** in the muscles and skin. This sign is typically observed on **magnetic resonance imaging (MRI)**.
**Why the Correct Answer is Right**
The correct answer is related to dermatomyositis, where the "shawl" sign is seen due to **subcutaneous edema** and **muscle inflammation** around the shoulders and upper back, resembling a shawl. This pattern is a result of the **immune-mediated** process that affects the skin and muscles in dermatomyositis.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to the "shawl" sign.
**Option B:** Incorrect as it does not describe the characteristic distribution of the "shawl" sign.
**Option C:** Incorrect because, although related to muscle diseases, it does not specifically describe the "shawl" sign.
**Clinical Pearl / High-Yield Fact**
The "shawl" sign is a memorable finding in dermatomyositis, which is an **inflammatory myopathy**. Recognizing this sign can aid in the diagnosis of dermatomyositis, distinguishing it from other muscle diseases.
**Correct Answer:** D. Dermatomyositis.