**Question:** All of the following are true about neck dissection except:

A. Neck dissection is a surgical procedure to remove cancerous or infected lymph nodes in the neck.
B. It is commonly performed for thyroid gland or oral cavity cancer.
C. It is contraindicated in patients with severe heart, lung, and kidney diseases.
D. The procedure is only indicated for patients with benign neck masses.

**Correct Answer:** **D. Neck dissection is only indicated for patients with benign neck masses.**

**Core Concept:** Neck dissection is a surgical procedure performed to remove cancerous or infected lymph nodes in the neck. This procedure is typically indicated when cancer has spread to the lymph nodes or when there is an infection in the neck region. Neck dissection is often done for thyroid gland or oral cavity cancers, as these tumors can spread to the regional lymph nodes.

**Why the Correct Answer is Right:** Neck dissection is not solely indicated for patients with benign neck masses. Benign neck masses can be managed with other surgical procedures, such as fine-needle aspiration biopsy (FNAB), excision biopsy, or observation, depending on the nature of the mass and the clinical presentation. In contrast, neck dissection aims to remove cancerous or infected lymph nodes, ensuring a proper evaluation of the lymph nodes and their sentinel status.

**Why Each Wrong Option is Incorrect:**

**A. Neck dissection is a surgical procedure to remove cancerous or infected lymph nodes in the neck.**
This option is correct as neck dissection is indeed a procedure used to treat cancerous or infected lymph nodes.

**B. Neck dissection is not performed for thyroid gland cancer.**
This option is incorrect as neck dissection can be performed for thyroid gland cancer, especially when the tumor is advanced or has spread to the regional lymph nodes.

**C. Neck dissection is contraindicated in patients with severe heart, lung, or kidney disease.**
This option is partially correct, as patients with severe heart, lung, or kidney disease may have increased surgical risks, which can complicate the procedure and increase the potential complications. However, this statement is too broad, and there are cases where neck dissection can be performed in patients with these comorbidities, after assessing the patient's overall clinical condition and surgical risk assessment.

**D. Neck dissection is only performed for benign neck masses.**
This option is incorrect as neck dissection is not solely indicated for benign neck masses. As mentioned earlier, neck dissection is primarily performed for cancerous or infected lymph nodes, ensuring proper evaluation of the lymph nodes and their sentinel status. However, neck dissection can also be performed for benign neck masses, such as lymphangioma, cysts, or dermoid cysts, if they are causing symptoms, compression, or impacting adjacent structures. In these cases, neck dissection can be a suitable procedure.

**Why This Option is Incorrect:** Neck dissection is not exclusively performed for benign neck masses. While neck dissection can be indicated for certain benign neck masses, it is primarily used to treat cancerous or infected lymph nodes, ensuring proper evaluation of the lymph nodes and their sentinel status. In