18 year old girl presents with amenorrhoea, milk discharge from bilateral breasts, weight loss. Most probable diagnosis is:-
## **Core Concept**
The patient's symptoms of amenorrhea (absence of menstruation), galactorrhea (milk discharge from the breasts), and weight loss suggest a disorder related to hormonal imbalance, particularly involving prolactin and possibly other pituitary hormones.
## **Why the Correct Answer is Right**
The combination of amenorrhea, galactorrhea, and weight loss in an 18-year-old girl is highly suggestive of a **prolactinoma**, which is a type of pituitary adenoma (tumor) that secretes excess prolactin. Prolactin stimulates milk production in the breasts, leading to galactorrhea. Elevated prolactin levels can disrupt the normal menstrual cycle, causing amenorrhea. Weight loss can occur due to the metabolic effects of the tumor or associated hormonal imbalances.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include conditions like thyroid disorders (e.g., hypothyroidism can cause galactorrhea and amenorrhea but is less likely to cause significant weight loss) or other types of pituitary tumors that do not secrete prolactin.
- **Option B:** Similarly, without the specific details, one might guess that this could represent a condition like Cushing's syndrome (which can cause weight loss and amenorrhea but is less commonly associated with galactorrhea).
- **Option C:** This could potentially represent another endocrine disorder, but without specifics, it's hard to evaluate its relevance directly.
- **Option D:** Assuming this is another condition, it might represent a less likely diagnosis such as a non-functioning pituitary adenoma, which could cause symptoms due to mass effect (e.g., visual field defects) but would not typically cause galactorrhea.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **prolactinoma** is a common cause of secondary amenorrhea and galactorrhea. Serum prolactin levels should be checked in patients presenting with these symptoms. A prolactin level >100 ng/mL is highly suggestive of prolactinoma, although levels can be elevated in other conditions as well.
## **Correct Answer: B. Prolactinoma.**