Accidental pituitary stalk damage will cause all except

Options

A. Diabetes mellitus
B. Diabetes insipidus
C. Hypothyroidism
D. Addison's disease

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the effects of accidental damage to the pituitary stalk and specifically mentions "all except," indicating that we need to identify which condition is not caused by such damage.

2. **Identifying the Pituitary Stalk**: The pituitary stalk, also known as the infundibulum, connects the pituitary gland to the hypothalamus. It plays a crucial role in hormone regulation and communication between these two important brain structures.

3. **Role of the Pituitary Gland**: The pituitary gland is often referred to as the "master gland" because it regulates various bodily functions by releasing hormones that control other glands in the endocrine system.

4. **Conditions Related to Pituitary Damage**:
- **Diabetes Insipidus**: This condition is caused by a deficiency of the hormone vasopressin (ADH), which is produced in the hypothalamus and released by the pituitary gland. Damage to the pituitary stalk can lead to this condition due to disrupted hormone release.
- **Hypothyroidism**: This condition results from insufficient production of thyroid hormones, which can occur if the pituitary gland fails to release Thyroid Stimulating Hormone (TSH) due to stalk damage.
- **Addison's Disease**: This disease affects the adrenal glands and is also influenced by the pituitary gland's release of Adrenocorticotropic Hormone (ACTH). Damage to the stalk can disrupt this hormone's release.

5. **Identifying the Exception**:
- **Diabetes Mellitus**: This condition is primarily related to insulin production by the pancreas and is not directly influenced by the pituitary gland. Therefore, it is the exception in this context.

6. **Conclusion**: Accidental damage to the pituitary stalk will cause all of the mentioned conditions (Diabetes Insipidus, Hypothyroidism, Addison's Disease) except for Diabetes Mellitus.

### Final Answer:
**Accidental pituitary stalk damage will cause all except Diabetes Mellitus.**

---