Hirsutism and Virilization

Definitions & Pathophysiology - Hair Scare Basics

• Hirsutism: Excess terminal hair, male pattern (Ferriman-Gallwey score ≥8). Androgen-dependent.
• Virilization: Masculinization signs (clitoromegaly, deep voice, ↑muscle bulk) from high androgens.
• Hypertrichosis: Generalized excessive hair growth; androgen-independent, not male pattern.

Androgen Sources: Ovaries, adrenal glands, peripheral conversion of prohormones. Key Enzyme Action: $Testosterone \xrightarrow{5\alpha\text{-reductase}} Dihydrotestosterone (DHT)$ in target tissues.

⭐ Hirsutism is androgen-dependent terminal hair growth in a male pattern, while hypertrichosis is generalized excessive hair growth that is androgen-independent.

, Testosterone to DHT by 5-alpha reductase, action on hair follicle in hirsutism context_

Etiology & Differential Diagnosis - Unwanted Whiskers

📌 Mnemonic 'PCOS ACTING':

• PCOS
• Adrenal (CAH, tumors)
• Cushing's syndrome
• Tumors (ovarian/adrenal)
• Iatrogenic/Idiopathic
• Non-classical CAH
• Genetic

Key Causes:

• Ovarian:
  • Polycystic Ovary Syndrome (PCOS) - most common
  • Androgen-secreting ovarian tumors (e.g., Sertoli-Leydig)
• Adrenal:
  • Congenital Adrenal Hyperplasia (CAH): esp. $21$-hydroxylase deficiency, $11\beta$-hydroxylase deficiency
  • Cushing's syndrome
  • Androgen-secreting adrenal tumors
• Drug-induced: Minoxidil, phenytoin, anabolic steroids, danazol
• Idiopathic Hirsutism: Diagnosis of exclusion

Comparison: Ovarian vs. Adrenal Causes

⭐ Polycystic Ovary Syndrome (PCOS) is the most common cause of hirsutism, affecting up to 70-80% of women with the condition.

Clinical Evaluation & Investigations - Spotting the Signs

• History Taking:
  • Onset & progression (rapid vs. gradual).
  • Menstrual history (irregularities, amenorrhea).
  • Family history (PCOS, CAH).
  • Drug history (e.g., anabolic steroids, danazol).
• Physical Examination:
  • Ferriman-Gallwey (F-G) Score: Quantifies hirsutism. Score >8 is significant.
  • Signs of Virilization: Clitoromegaly, deep voice, temporal balding, $↑$muscle mass.
  • Associated Signs: Acanthosis nigricans (PCOS), goiter, striae (Cushing's).
• Investigations:
  • Initial Hormonal Assays (morning, follicular phase):
    • Total Testosterone: >200 ng/dL (>7 nmol/L) → tumor workup.
    • DHEAS: >700 µg/dL (>19 µmol/L) → adrenal source workup.
    • 17-OH Progesterone: >200 ng/dL → NCAH screen (ACTH stim test).
  • Imaging:
    • Pelvic USG: Ovarian assessment (PCOS, tumors).
    • Adrenal/Ovarian CT/MRI: If tumor suspected (rapid virilization or very high androgens).

⭐ Rapid onset of hirsutism with virilization strongly suggests an androgen-secreting neoplasm of the ovary or adrenal gland.

Management Strategies - Treatment Toolkit

• General & Cosmetic Measures:
  • Lifestyle: Weight loss if obese.
  • Cosmetic: Shaving, waxing, laser, electrolysis.
• Pharmacological Therapy:
  • Combined Oral Contraceptives (COCs): First-line.
  • Anti-androgens: Add if COCs insufficient after 6 months.
    • Spironolactone 50-200 mg/day.
    • Others: Cyproterone Acetate (CPA), Finasteride, Flutamide.
  • Topical Eflornithine: Reduces hair growth; adjunct.
  • GnRH analogs: For severe, refractory cases.
• Address Underlying Cause: E.g., CAH (glucocorticoids), tumor removal.

⭐ Pharmacological treatments for hirsutism typically require 6-9 months to show noticeable improvement due to the hair growth cycle.

High‑Yield Points - ⚡ Biggest Takeaways

• Polycystic Ovary Syndrome (PCOS) is the most common cause of hirsutism.
• Ferriman-Gallwey score > 8 defines hirsutism; assess severity.
• Sudden onset or rapid progression of virilization suggests an androgen-secreting tumor (ovarian or adrenal).
• Key initial investigations: serum total testosterone and DHEAS. Consider 17-OHP for suspected late-onset CAH.
• Oral contraceptive pills (OCPs) are first-line for idiopathic hirsutism and PCOS.
• Spironolactone is a commonly used anti-androgen; finasteride is an alternative.
• Always rule out Cushing's syndrome and thyroid dysfunction if clinically suspected based on features beyond hirsutism/virilization.