A 42-year-old woman from Delhi presents with a 6-month history of heavy menstrual bleeding lasting 10–12 days per cycle. She reports passage of clots and denies intermenstrual bleeding. Pelvic examination reveals a uniformly enlarged, firm uterus without nodularity. Transvaginal ultrasound shows a heterogeneous myometrium with multiple hypoechoic lesions of varying sizes, the largest measuring 3 cm. Hemoglobin is 9.2 g/dL. What is the most likely diagnosis?

## Clinical Diagnosis: Adenomyosis ### Key Presentation Features **Key Point:** The combination of heavy menstrual bleeding (menorrhagia) lasting 10–12 days, passage of clots, a **uniformly enlarged, firm uterus without nodularity**, and **heterogeneous myometrium with multiple hypoechoic lesions** on transvaginal ultrasound is the classic presentation of **adenomyosis** — not uterine fibroids. ### Why Adenomyosis and Not Fibroids? The critical distinguishing features in this vignette are: | Feature | Adenomyosis | Uterine Fibroids | |---------|-------------|-----------------| | Uterine enlargement | **Uniform, globular, no nodularity** | Irregular, nodular, asymmetric | | Ultrasound appearance | **Diffuse heterogeneous myometrium, ill-defined hypoechoic areas** | Discrete, well-defined hypoechoic/heterogeneous masses | | Junctional zone | Thickened (>12 mm) | Normal | | Uterine contour | Smooth | Lobulated/irregular | | Doppler | Increased vascularity within myometrium | Peripheral vascularity around lesion | In adenomyosis, endometrial glands and stroma are embedded within the myometrium, causing **diffuse myometrial hypertrophy** that results in a uniformly enlarged, firm ("boggy") uterus. The hypoechoic lesions seen on ultrasound represent **adenomyomas** (focal adenomyosis) or cystic spaces within the myometrium — these are **not discrete, well-circumscribed masses** as seen in fibroids. ### Pathophysiology of Menorrhagia in Adenomyosis 1. **Increased endometrial surface area** due to myometrial hypertrophy 2. **Impaired uterine contractility** → failure of hemostasis 3. **Altered prostaglandin synthesis** → increased vasodilation and fibrinolysis 4. **Ectopic endometrial tissue** responds to hormonal cycles → cyclic bleeding within myometrium ### Why Other Options Are Incorrect - **A) Endometrial cancer:** Typically presents with postmenopausal or intermenstrual bleeding, not cyclic menorrhagia; uterus may be enlarged but ultrasound shows endometrial thickening, not myometrial heterogeneity. - **C) Endometrial polyps:** Present with intermenstrual spotting or irregular bleeding; ultrasound shows focal echogenic endometrial lesions, not myometrial changes. - **D) Uterine fibroids:** Would present with an **irregular, nodular uterus** and **discrete, well-defined hypoechoic masses** on ultrasound — not diffuse myometrial heterogeneity with a uniformly enlarged smooth uterus. ### Clinical Pearl **Clinical Pearl:** The classic triad of adenomyosis is: (1) menorrhagia, (2) dysmenorrhea, and (3) uniformly enlarged, tender uterus ("boggy uterus"). Transvaginal ultrasound showing myometrial heterogeneity, asymmetric myometrial thickening, and subendometrial cysts is highly suggestive. MRI is the gold standard for diagnosis (junctional zone thickness >12 mm). *(Shaw's Textbook of Gynaecology, 17th ed., Ch. 20; Jeffcoate's Principles of Gynaecology, 8th ed.)* ### High-Yield Facts **High-Yield:** - Adenomyosis is most common in multiparous women aged 40–50 years. - Definitive diagnosis is histological (post-hysterectomy), but MRI/TVUS are used clinically. - Iron-deficiency anemia (Hb 9.2 g/dL here) results from chronic heavy menstrual blood loss. - Treatment: Medical (LNG-IUS, GnRH agonists, COCs) or surgical (hysterectomy — definitive). [cite: Shaw's Textbook of Gynaecology, 17th ed., Ch. 20; Jeffcoate's Principles of Gynaecology, 8th ed., Ch. 14]