Differentials

Common

Polycystic ovary syndrome

History

oligomenorrhoea (<8 periods a year), infertility

Exam

clinical signs of hyperandrogenism other than hirsutism (acne, male-pattern alopecia); obesity (in about 50% of women); acanthosis nigricans may be present

1st investigation
  • transvaginal ultrasound:

    ≥12 follicles measuring 2 mm to 9 mm in diameter and/or increased ovarian volume (>10 mL) in follicular phase ovary[13]

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Other investigations
  • serum total and free testosterone:

    elevated

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Idiopathic hirsutism

History

regular menstrual cycles, no identifiable aetiology for the excessive hair growth

Exam

mild to moderate hirsutism

1st investigation
  • total testosterone:

    normal

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Other investigations

    Uncommon

    Hyperprolactinaemia

    History

    oligomenorrhoea, galactorrhoea, infertility

    Exam

    galactorrhoea, may have bilateral hemianopsia

    1st investigation
    • serum prolactin:

      >20 micrograms/L (20 nanograms/mL)

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    Other investigations
    • MRI of hypothalamic/pituitary area:

      may show sellar, or suprasellar mass

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    Non-classical congenital adrenal hyperplasia

    History

    premature pubarche, short stature, acne, menstrual irregularity, oligomenorrhoea, primary amenorrhoea, infertility, early onset of hirsutism, family history of congenital adrenal hyperplasia[28]

    Exam

    acne, clitoromegaly (10% of the patients), alopecia (8%)[28]

    1st investigation
    • serum 17-hydroxyprogesterone:

      >6 nanomol/L (200 nanograms/dL)

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    Other investigations
    • adrenocorticotropic hormone (ACTH) stimulation test:

      17-hydroxyprogesterone >45 nanomol/L (1500 nanograms/dL)

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    Cushing's syndrome

    History

    menstrual irregularity, bruising, emotional lability

    Exam

    hypertension, truncal obesity associated with nuchal fat pad, moon face, facial plethora, purple striae, proximal muscle weakness

    1st investigation
    • salivary cortisol:

      elevated

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    • 24-hour urinary free cortisol:

      elevated

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    Other investigations
    • overnight dexamethasone suppression test:

      morning cortisol >50 nanomol/L (1.8 micrograms/dL)

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    Androgenic drugs

    History

    use of androgenic drugs (e.g., anabolic or androgenic steroids, danazol, oral contraceptives with androgenic progestins)

    Exam

    mild to moderate hirsutism

    1st investigation
    • stop causative drug:

      improvement in hirsutism

    Other investigations

      Androgen-secreting ovarian tumour

      History

      older age, rapid progression, virilisation

      Exam

      signs of virilisation; palpable abdominal mass or palpable mass on vaginal examination

      1st investigation
      • pelvic ultrasound:

        presence of solid, complex, septated, multiloculated mass; high blood flow

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      • CA-125:

        may be raised

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      Other investigations
      • abdominal/pelvic MRI without and with gadolinium contrast:

        presence of vascular vegetations in cystic masses and ascites, suggests malignancy

      • PET, PET-CT, or PET/MRI:

        presence of abnormal lesions; can help distinguish between benign and malignant ovarian tumours

      Ovarian hyperthecosis

      History

      may occur after menopause, intense hirsutism of slow progression, virilisation, amenorrhoea, or irregular menses

      Exam

      obesity, virilisation (clitoromegaly, temporal balding, deepening of the voice, increased muscle mass), moderate to severe hirsutism, acanthosis nigricans

      1st investigation
      • total testosterone:

        elevated

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      • transvaginal ultrasound:

        increase in ovarian stroma with hyperechogenicity and few or absent cysts

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      Other investigations

        Adrenocortical carcinoma

        History

        abdominal pressure or pain, acne, progressive hirsutism, amenorrhoea or oligomenorrhoea, gynaecomastia, diabetes mellitus

        Exam

        hypertension, virilisation, cushingoid features (bruising, thin skin, facial plethora, purple striae)

        1st investigation
        • CT abdomen:

          large and heterogenous mass, usually >4 cm, with irregular contour and >10 Hounsfield units on unenhanced CT; vascular mass on contrast-enhanced CT with contrast washout <60% at 15 minutes

        Other investigations
        • MRI abdomen:

          hyperintense mass in relation to liver on T2-weighted images

        • 18-fluoro-2-deoxyglucose (FDG) PET:

          focal activity in the lesion, may display central photopenic area surrounded by rim of intense activity if large tumour with necrotic centre

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