VHOSPITAL.CLINIC · Differential Diagnosis
Adenomyosis vs Endometriosis
Clinical comparison — shared symptoms, key differences, distinguishing diagnostic tests, treatment pathways, and when to seek urgent evaluation.
Condition Overview
Condition A
Adenomyosis
Adenomyosis occurs when endometrial tissue grows within the muscular wall of the uterus, causing heavy, painful periods and an enlarged uterus. It often coexists with endometriosis; hormonal therapy and hysterectomy are treatment options.
Condition B
Endometriosis
Endometriosis is a condition where tissue similar to the uterine lining grows outside the uterus. It causes chronic pelvic pain, especially during menstruation, and can lead to infertility. It affects approximately 10% of reproductive-age women.
Shared Symptoms — Why They're Confused
Both conditions present with 2 overlapping symptoms, making clinical differentiation essential.
Key Clinical Differences
Adenomyosis
- Endometrial glands within the myometrium — diffuse uterine enlargement
- Severe dysmenorrhoea + menorrhagia
- Bulky globular uterus on examination
- MRI: heterogeneous myometrium, junctional zone >12 mm
Endometriosis
- Endometrial tissue outside the uterus — ovaries, peritoneum, bladder
- Cyclic pelvic pain, dyspareunia, dyschezia, infertility
- Normal or mildly enlarged uterus
- Laparoscopic confirmation of implants
Distinguishing Diagnostic Tests
| Test | Adenomyosis | Endometriosis |
|---|---|---|
| MRI pelvis | Junctional zone >12 mm, heterogeneous myometrium — adenomyosis | Endometrioma in ovary, peritoneal implants — endometriosis |
| Transvaginal ultrasound | Asymmetric myometrial thickening; myometrial cysts; fan-shaped shadowing | Ovarian endometrioma (homogeneous ground glass); normal uterus |
| Uterine size | Enlarged, globular uterus — adenomyosis diffusely thickens myometrium | Normal or mildly enlarged uterus |
Treatment Approaches
Adenomyosis
- •Combined OCP or progestogens (LNG-IUS is highly effective)
- •GnRH agonists for severe disease
- •Hysterectomy for definitive cure
Endometriosis
- •Hormonal suppression (OCP, GnRH, LNG-IUS)
- •Laparoscopic excision of endometriomas and implants
- •IVF for infertility (does not require prior excision in all cases)
When Doctors Consider Each Diagnosis
🔵 Consider Adenomyosis when:
- →Heavy periods, enlarged globular uterus, junctional zone >12 mm on MRI
🟢 Consider Endometriosis when:
- →Dyspareunia, infertility, endometrioma on USS, laparoscopic implants, normal uterus size
Explore Each Condition in Detail
Related Clinical Pages
Adenomyosis
Medical References
Content on this page is informed by evidence-based clinical sources including:
- World Health Organization (WHO)Global health guidance and disease classification
- National Health Service (NHS)UK clinical guidelines and patient information
- National Institute for Health and Care Excellence (NICE)Evidence-based clinical practice guidelines
- Centers for Disease Control and Prevention (CDC)US public health data and clinical recommendations
- PubMed – NCBIPeer-reviewed biomedical literature and clinical studies
- Cochrane LibrarySystematic reviews and meta-analyses in evidence-based medicine
Not sure which condition applies to you?
Describe your symptoms and get a structured clinical assessment — possible causes, red flags, and recommended next steps.
Start Free AI Analysis →