Port-Wine stain is common in:
**Core Concept**
Port-Wine stain, also known as naevus flammeus, is a congenital vascular malformation characterized by an abnormal collection of blood vessels near the surface of the skin. It typically presents as a pink to purple discoloration, often in a linear or blotchy pattern. Port-Wine stains are usually unilateral and can be associated with underlying neurological abnormalities.
**Why the Correct Answer is Right**
Port-Wine stains are commonly seen in Sturge-Weber syndrome, a rare congenital disorder that affects the development of blood vessels and the central nervous system. This condition is characterized by the presence of a port-wine stain on the face, typically in the distribution of the trigeminal nerve, along with other systemic manifestations such as glaucoma, seizures, and intellectual disability. The port-wine stain in Sturge-Weber syndrome is thought to result from the abnormal formation of blood vessels during embryonic development.
**Why Each Wrong Option is Incorrect**
**Option A:** Staphylococcal scalded skin syndrome - This condition is caused by the exfoliative toxins produced by Staphylococcus aureus and is characterized by a blistering skin rash, not a vascular malformation.
**Option B:** Erythema multiforme - This is an immune-mediated skin disorder that presents with target lesions, not a congenital vascular malformation.
**Option C:** Malignant melanoma - This is a type of skin cancer that can present as a pigmented lesion, but it is not a congenital vascular malformation.
**Clinical Pearl / High-Yield Fact**
Sturge-Weber syndrome is a classic example of a congenital disorder that can be associated with a port-wine stain. It is essential to recognize the characteristic findings of this condition, including the port-wine stain, glaucoma, and seizures, to provide appropriate diagnosis and management.
**Correct Answer:** D. Sturge-Weber syndrome.