Adenomyosis differs from endometriosis histologically in that adenomyosis is defined by:
- A Endometrial glands and stroma outside the uterus
- B Endometrial glands within the perimetrium only
- C Endometrial glands and stroma within the myometrium, more than one low-power field from the basal endometrium ✓
- D Ectopic endometrial tissue within the cervix
Correct answer: C. Endometrial glands and stroma within the myometrium, more than one low-power field from the basal endometrium
Explanation
Adenomyosis is defined histologically as the presence of endometrial glands and stroma embedded within the myometrium, conventionally more than one low-power field (>2.5 mm) from the basal endometrium. This distinguishes it from the normal invagination of endometrial tissue. Endometriosis refers to endometrial-type tissue outside the uterus.
Reference: Shaw's Textbook of Gynaecology, 17th ed.
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