**Core Concept**
Pigmented basal cell carcinoma (BCC) is a rare variant of basal cell carcinoma, characterized by the presence of melanin pigmentation within the tumor. The treatment of choice for pigmented BCC is a topic of debate, but it is generally considered to be more aggressive and challenging than the non-pigmented form.

**Why the Correct Answer is Right**
The treatment of choice for pigmented BCC is Mohs surgery, also known as Mohs micrographic surgery (MMS). MMS is a highly effective and precise surgical technique that involves the removal of the tumor in thin layers, with examination of each layer under a microscope to ensure complete removal of the tumor while sparing as much normal tissue as possible. This approach is particularly useful for pigmented BCC, as it allows for the removal of the tumor while minimizing the risk of recurrence and preserving the surrounding tissue.

**Why Each Wrong Option is Incorrect**
**Option A:** Radiation therapy is not the treatment of choice for pigmented BCC, as it may not be effective in completely removing the tumor and can cause damage to surrounding tissue.
**Option B:** Topical treatments, such as imiquimod, are not effective in treating pigmented BCC, as they may not penetrate deeply enough to reach the entire tumor.
**Option C:** Surgical excision with wide margins is not the preferred treatment for pigmented BCC, as it may result in significant tissue loss and scarring.

**Clinical Pearl / High-Yield Fact**
Mohs surgery is a highly effective treatment for pigmented BCC, with a high cure rate and minimal tissue loss. It is particularly useful for tumors located in cosmetically sensitive areas, such as the face and ears.

**Correct Answer:** C. Surgical excision with wide margins is not the preferred treatment for pigmented BCC, as it may result in significant tissue loss and scarring.