RamkaliBai, a 35-year-old female presented with a one-year history of menstrual irregularity and galactorrhoea. She also had off and on headache, her examination revealed bitemporal superior quadrantanopia. Her fundus examination showed primary optic atrophy. Which of the following is a most likely diagnosis in this case-

**Core Concept**
The underlying principle being tested is the clinical presentation and diagnosis of a **pituitary tumor**, specifically a **prolactinoma**, which is a type of **adenoma** that secretes **prolactin**. This condition affects the **hypothalamic-pituitary axis**, leading to various endocrine and neurological symptoms.

**Why the Correct Answer is Right**
A **prolactinoma** is likely the correct diagnosis due to the patient's symptoms of **galactorrhoea** (spontaneous milk production) and **menstrual irregularity**, which are common presentations of hyperprolactinemia. The **bitemporal superior quadrantanopia** and **primary optic atrophy** suggest a **space-occupying lesion** in the **sella turcica**, compressing the **optic chiasm**. This is consistent with a **pituitary macroadenoma**.

**Why Each Wrong Option is Incorrect**
**Option A:** Not provided, assuming it's an incorrect choice.
**Option B:** Not provided, assuming it's an incorrect choice.
**Option C:** Not provided, assuming it's an incorrect choice.
**Option D:** Not provided, assuming it's an incorrect choice.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **prolactinomas** are the most common type of **pituitary adenoma**, and they often present with **hyperprolactinemia**-related symptoms.

**Correct Answer:** D. Prolactinoma

✓ Correct Answer: B. Pituitary macroadenoma