A 28-year-old married woman from Delhi presents with primary infertility of 3 years duration. Menarche at age 13, cycles regular (28–30 days) until 2 years ago, now irregular with scanty menses. BMI 32 kg/m², hirsutism on face and forearms, acne on chin. Pelvic ultrasound shows multiple small follicles arranged peripherally in both ovaries with increased stromal echogenicity. FSH 7 mIU/mL, LH 18 mIU/mL, testosterone 0.8 ng/mL (elevated). What is the most likely diagnosis?

Explanation

## Clinical Diagnosis: Polycystic Ovary Syndrome (PCOS) ### Key Diagnostic Criteria (Rotterdam 2003) The patient meets ≥2 of 3 criteria: | Criterion | Finding in This Case | |-----------|----------------------| | **Oligo/anovulation** | Irregular, scanty menses | | **Clinical/biochemical hyperandrogenism** | Hirsutism, acne, elevated testosterone | | **Polycystic ovarian morphology on ultrasound** | Multiple small follicles, increased stromal echogenicity | **Key Point:** PCOS is a diagnosis of exclusion; other causes of hyperandrogenism (Cushing's, adrenal tumors, androgen-secreting tumors) must be ruled out, but the classic presentation here is PCOS. ### Hormonal Profile in PCOS **High-Yield:** The LH:FSH ratio is typically **≥3:1** (here 18:7 = 2.6, borderline but elevated LH is diagnostic). This reflects abnormal GnRH pulsatility. - **Elevated LH** → drives excessive androgen production by theca cells - **Normal or low-normal FSH** → inadequate follicle maturation - **Elevated testosterone** (free and total) → clinical hyperandrogenism - **Elevated AMH** (not measured here, but typical) → reflects increased follicle number ### Pathophysiology ```mermaid flowchart TD A[Insulin resistance + Genetic predisposition]:::outcome --> B[Hyperinsulinemia]:::outcome B --> C[↑ LH secretion via GnRH]:::outcome C --> D[Excessive theca cell androgen production]:::outcome D --> E[Anovulation + Clinical hyperandrogenism]:::outcome B --> F[↓ SHBG in liver]:::outcome F --> G[↑ Free androgen]:::outcome G --> E E --> H[Infertility]:::urgent ``` ### Clinical Features Present - **Metabolic:** Obesity (BMI 32), insulin resistance (common in PCOS) - **Reproductive:** Oligomenorrhea, infertility, anovulation - **Endocrine:** Hirsutism, acne (androgen excess) - **Imaging:** Polycystic ovarian morphology **Clinical Pearl:** PCOS is the most common cause of anovulatory infertility in reproductive-age women, accounting for ~70–80% of anovulatory cases. ### Management Approach 1. **First-line for ovulation induction:** Clomiphene citrate (anti-estrogen, increases FSH) 2. **Insulin sensitizers:** Metformin (improves ovulation rates, reduces miscarriage) 3. **Lifestyle modification:** Weight loss 5–10% improves ovulation and metabolic parameters 4. **If clomiphene fails:** Letrozole (aromatase inhibitor) or gonadotropins **Mnemonic — PCOS Features: HAIR-AN** - **H**irsutism - **A**cne - **I**nfertility - **R**ecurrent miscarriage - **A**ndrogenism (biochemical) - **N**ormal or elevated LH