## **Core Concept**
Paget's disease of the nipple is a rare form of breast cancer characterized by eczema-like changes to the skin of the nipple and areola. It is often associated with an underlying breast cancer, typically ductal carcinoma in situ (DCIS) or invasive breast cancer. The treatment aims to address both the skin manifestation and the underlying malignancy.

## **Why the Correct Answer is Right**
The correct approach to treating Paget's disease of the nipple involves surgical intervention. This typically includes mastectomy (removal of the breast) or breast-conserving surgery, often followed by radiation therapy, depending on the extent of the disease and the presence of invasive cancer. The goal is to remove the cancerous cells completely.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While diagnostic procedures like biopsy are crucial for confirming the diagnosis, they are not a treatment but rather a diagnostic tool.
- **Option B:** Radiation therapy may be part of the treatment plan, especially if breast-conserving surgery is performed or if there's a significant component of DCIS or invasive cancer. However, it is not the standalone treatment for Paget's disease of the nipple.
- **Option C:** This option is not provided, but typically, chemotherapy might be considered in certain cases of invasive cancer but is not the primary treatment for Paget's disease of the nipple.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that Paget's disease of the nipple is often associated with an underlying breast malignancy. Therefore, any eczema-like change in the nipple-areolar complex should prompt a thorough investigation, including biopsy, to rule out cancer. Early diagnosis and appropriate surgical intervention are critical for optimal outcomes.

## **Correct Answer:** . Mastectomy