**Core Concept**
A large port-wine hemangioma, also known as a port-wine stain or nevus flammeus, is a congenital vascular malformation characterized by an abnormal collection of blood vessels in the skin, typically presenting as a red or purple birthmark. The condition is often associated with underlying neurological abnormalities, including Sturge-Weber syndrome. Effective treatment requires a multidisciplinary approach to manage the aesthetic and potential neurological implications.

**Why the Correct Answer is Right**
The best method to treat a large port-wine hemangioma involves a combination of laser therapy and surgical excision. **Pulsed dye laser** (PDL) is a commonly used modality to reduce the color and size of the hemangioma, while **surgical excision** may be necessary for larger lesions or those that are resistant to laser treatment. This approach can help minimize the risk of complications, such as scarring, infection, and neurological damage.

**Why Each Wrong Option is Incorrect**
**Option A:** **Radiofrequency ablation** is not typically used for port-wine hemangioma treatment, as it may not be as effective in reducing the size and color of the lesion.
**Option B:** **Surgical excision alone** may not be sufficient to treat a large port-wine hemangioma, as it may not address the underlying vascular malformation.
**Option C:** **Topical corticosteroids** are not an effective treatment for port-wine hemangioma, as they do not address the underlying vascular abnormality.

**Clinical Pearl / High-Yield Fact**
A key consideration when treating port-wine hemangioma is the potential association with Sturge-Weber syndrome, which requires a comprehensive evaluation of the patient's neurological status.

**Correct Answer: C. Surgical excision with pulsed dye laser therapy.**