**Core Concept**
Patey's mastectomy is a surgical procedure used in the management of breast cancer. It involves the removal of the breast, underlying fascia, and some lymph nodes in the axilla. The technique aims to balance the need for oncological clearance with the preservation of arm function.

**Why the Correct Answer is Right**
Patey's mastectomy does not involve the removal of the pectoralis minor muscle. This muscle is preserved to maintain shoulder mobility and prevent the formation of a fibrotic tract between the chest wall and the shoulder, which can lead to frozen shoulder (adhesive capsulitis). The preservation of the pectoralis minor muscle also allows for better re-expansion of the skin envelope and improved cosmetic outcomes.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the description of Patey's mastectomy.
**Option B:** While the removal of the pectoralis major muscle is not a characteristic of Patey's mastectomy, it is not the primary muscle spared in this procedure.
**Option C:** The axillary lymph nodes are indeed removed in Patey's mastectomy, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
In breast cancer surgery, the preservation of the pectoralis minor muscle can significantly impact postoperative shoulder function and patient satisfaction.

**Correct Answer: D. Removal of the pectoralis minor muscle is not done in Patey's mastectomy.**