A 20-year old average weight female complains of oligomenorrhea along with facial hair. Preliminary investigations reveal raised free testosterone levels. USG Pelvis: ovary shows normal morphology. Which of the following could be likely etiology
**Core Concept**
The patient's symptoms of oligomenorrhea and hirsutism, combined with elevated free testosterone levels and normal ovarian morphology, suggest a disorder of androgen excess. This condition can be caused by various factors, including hormonal imbalances, genetic disorders, or external influences.
**Why the Correct Answer is Right**
The most likely etiology in this case is Polycystic Ovary Syndrome (PCOS), a common endocrine disorder in women of reproductive age. PCOS is characterized by hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology. However, in this case, the ultrasound shows normal ovarian morphology, which is a key feature distinguishing PCOS from other androgen excess disorders. The patient's symptoms and lab findings are consistent with non-classical congenital adrenal hyperplasia (NCAH), specifically 21-hydroxylase deficiency, which is a genetic disorder leading to excessive production of androgens due to impaired cortisol production.
**Why Each Wrong Option is Incorrect**
**Option A:** **Hyperprolactinemia** can cause oligomenorrhea and galactorrhea, but it is not typically associated with hirsutism and elevated free testosterone levels.
**Option B:** **Thyroid disorders** can cause menstrual irregularities, but they are not directly linked to androgen excess and hirsutism.
**Option C:** **Androgen-secreting tumors** are rare and would typically present with more severe symptoms, including virilization.
**Clinical Pearl / High-Yield Fact**
In women with oligomenorrhea and hirsutism, a normal ultrasound does not rule out PCOS, and other causes of androgen excess should be considered, such as non-classical congenital adrenal hyperplasia.
**Correct Answer:** C.