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PA29.2-10 | Female Genital Tract — PBL Case

CLINICAL SETTING

Meena, a 22-year-old married woman from a semi-rural town in Andhra Pradesh, presents to the gynaecology emergency of a district hospital at 11 weeks of her first pregnancy. She reports heavy vaginal bleeding for two days, severe nausea and vomiting that prevented her from eating for a week, and a uterus that her village ANM noted was 'much larger than it should be for 3 months.' The ANM's pregnancy test card — the cheapest strip test — became so strongly positive that it showed a colour band almost immediately. At the district hospital, a urine beta-hCG test returns markedly positive; a point-of-care quantitative assay reads 340,000 mIU/mL. Pelvic examination reveals an irregular, soft, 18-week-sized uterus with active bleeding from the os. No foetal parts or foetal heart sounds are detected on handheld Doppler.

Trigger 1: Uterus Larger Than Dates

An urgent ultrasound is obtained on the hospital's older 2D machine. The radiographer describes a 'snowstorm' or 'starry sky' pattern filling the uterine cavity with no identifiable foetal pole or amniotic sac. The ovaries appear bulky with bilateral multicystic enlargement — the largest cyst measuring 5 cm on the right. The junior resident reviews the beta-hCG result (340,000 mIU/mL) against expected values for 11 weeks of normal pregnancy. The obstetrics consultant orders emergency suction evacuation under general anaesthesia. The evacuated material is sent to the pathology laboratory.

DISCUSSION POINTS

  • The beta-hCG at 340,000 mIU/mL is grossly elevated for 11 weeks of pregnancy. Which gestational trophoblastic condition does this clinical triad — uterus larger than dates, very high hCG, absent foetal parts — most likely represent?
  • What is the chromosomal basis of a complete hydatidiform mole, and how does its karyotype arise? Contrast this with the karyotype and pathogenesis of a partial hydatidiform mole.
  • The ultrasound shows bilateral multicystic ovarian enlargement. What causes theca-lutein cysts in the setting of gestational trophoblastic disease, and why are they a marker of severity?
  • When the evacuated material arrives in pathology, what gross features — and what two histological features of trophoblastic hyperplasia — will distinguish a complete mole from hydropic degeneration of a missed miscarriage?
Click to reveal Trigger 2: After Evacuation — Watching the Marker (discuss previous trigger first!)

Trigger 2: After Evacuation — Watching the Marker

Histopathology confirms complete hydatidiform mole: hydropic villi with cistern formation, circumferential trophoblastic hyperplasia involving both cyto- and syncytiotrophoblast, and no foetal or embryonic tissue. Immunostaining for p57 is negative in the villous stroma and cytotrophoblast. Meena is counselled about the 15–20% risk of persistent gestational trophoblastic disease (GTD) and enrolled in weekly beta-hCG monitoring. Her hCG falls appropriately for six weeks, then plateaus for two consecutive measurements at 4,200 mIU/mL. A CT chest and pelvis are ordered. CT shows two 1.2 cm nodules in the right lower lobe of the lung and a 2.8 cm vascular mass in the uterine fundus.

DISCUSSION POINTS

  • The hCG plateau followed by imaging showing lung nodules and a uterine mass suggests progression to a malignant form of GTD. Distinguish between invasive mole and gestational choriocarcinoma on the basis of histological findings — specifically, does a choriocarcinoma contain chorionic villi?
  • Choriocarcinoma has one of the highest cure rates of any metastatic cancer when treated with chemotherapy. What biological property of gestational choriocarcinoma — related to its foreign (paternal) genomic content — makes it exquisitely sensitive to cytotoxic drugs?
  • Explain what the p57 immunostain detects, why it is negative in a complete mole, and how this result (combined with karyotype) helps distinguish a complete mole from a partial mole or hydropic abortion.
  • At what level should hCG have reached normal after molar evacuation, and what hCG surveillance pattern (plateau or rise) triggers the diagnosis of persistent GTD requiring treatment?
Click to reveal Trigger 3: A Second Patient on the Same Ward (discuss previous trigger first!)

Trigger 3: A Second Patient on the Same Ward

The next bed on the same gynaecology ward holds Savitri, a 34-year-old woman with two prior full-term deliveries, admitted for investigation of progressive pelvic pain worsening with menstruation, deep dyspareunia, and an inability to conceive for three years despite regular unprotected intercourse. She is afebrile, not pregnant. On bimanual examination, the uterus is fixed and retroverted, and there is a tender 8 cm left adnexal mass. Serum CA-125 is elevated at 92 U/mL. A diagnostic laparoscopy reveals blue-black 'powder-burn' lesions on the peritoneum and a thick-walled left ovarian cyst containing viscous dark-brown fluid. The right ovary appears normal. An endometrial biopsy from the uterine cavity, taken at the same procedure, shows back-to-back crowded glands with cytological atypia referred to as 'atypical glandular proliferation.'

DISCUSSION POINTS

  • Savitri's laparoscopic and histological findings describe endometriosis. What are the three components required for the histological diagnosis of endometriosis, what is the dark-brown content of the ovarian cyst, and what is the correct clinical term for this specific type of ovarian cyst?
  • The uterus is fixed and retroverted. Explain the pathological mechanism by which endometriosis produces a fixed, immobile uterus, and contrast 'fixed retroversion' (clinically significant) with 'normal variant retroversion' (clinically insignificant).
  • The endometrial biopsy shows atypical glandular proliferation with gland crowding and nuclear atypia. Using the WHO two-tier classification, categorise this finding and explain the malignant transformation risk that separates non-atypical from atypical/EIN lesions.
  • If Savitri were to develop endometrial carcinoma arising from this background, what molecular pathway (Type I vs Type II), hormonal driver, and histological subtype would be most likely? How does this contrast with the Type II serous pathway?

Group Task Assignments

Group 1: Gestational trophoblastic disease spectrum

  • Construct a comparison table covering complete mole, partial mole, invasive mole, and choriocarcinoma — include karyotype, hCG level, histological features (villi present/absent), malignant potential, and treatment.
  • Draft a one-page patient explanation (in simple English) explaining to a young woman why she must comply with hCG surveillance for 6–12 months after molar evacuation.

Competencies: PA29.5

Group 2: Endometriosis and adenomyosis — mechanisms and morphology

  • Draw and annotate the three most common sites of endometriosis implants and list the three histological criteria required for diagnosis.
  • Prepare a structured comparison of endometriosis versus adenomyosis covering definition, location, clinical features, and ultrasound/MRI findings.

Competencies: PA29.7, PA29.8

Group 3: Endometrial hyperplasia and carcinoma

  • Illustrate the endometrium-to-carcinoma continuum: normal cycling endometrium → non-atypical hyperplasia → atypical hyperplasia/EIN → endometrioid carcinoma, labelling the hormonal driver at each step.
  • List five clinical risk factors for Type I endometrial carcinoma and explain the mechanistic link between each risk factor and unopposed oestrogen.

Competencies: PA29.2, PA29.9

Group 4: Ovarian tumour classification and clinical presentations

  • Create a WHO cell-of-origin framework for ovarian tumours and attach one representative tumour, one characteristic marker, and one key morphological feature to each major category.
  • Explain the clinical and pathological features that distinguish a primary ovarian carcinoma from a Krukenberg tumour, including the origin of the Krukenberg tumour and the classic signet-ring cell morphology.

Competencies: PA29.4

Group 5: Morphological identification — female genital tract practical

  • Prepare a recognition card for leiomyoma vs leiomyosarcoma covering gross colour, consistency, edge definition, cut surface pattern, mitotic count threshold, and clinical behaviour post-menopause.
  • Sketch and label the key microscopic features of: (a) follicular cervicitis, (b) a 'chocolate cyst' wall, (c) adenomyosis in the myometrium, and (d) atypical endometrial hyperplasia/EIN.

Competencies: PA29.3, PA29.6, PA29.10

Learning Issues

Research these questions and bring your findings to the discussion.

  1. [PA29.2] What are the Type I and Type II pathways of endometrial carcinoma, how do they differ in hormonal dependence, histological subtype, molecular alterations (MSI vs p53), and prognosis?
  2. [PA29.3] What is the pathogenesis, hormonal dependence, gross and microscopic morphology of uterine leiomyoma, and how does leiomyosarcoma differ in its clinical behaviour, mitotic count criteria, and post-menopausal course?
  3. [PA29.4] How are ovarian tumours classified by cell of origin, and what are the defining pathological, marker, and clinical features of the major types including HGSC, mucinous tumours, mature teratoma, dysgerminoma, yolk sac tumour, and granulosa cell tumour?
  4. [PA29.5] What is the karyotypic and pathological basis for distinguishing complete from partial hydatidiform mole, and how do the malignant forms of gestational trophoblastic disease (invasive mole, choriocarcinoma) differ morphologically and behaviourally?
  5. [PA29.6] What organisms cause acute and chronic cervicitis, what are the histological features of follicular cervicitis, and how does the transformation zone relate to susceptibility to both cervicitis and dysplasia?
  6. [PA29.7] What is the definition of endometriosis, what are its three most common sites, what are the three histological criteria for diagnosis, and how does the chocolate cyst form in the ovary?
  7. [PA29.8] How is adenomyosis defined histologically, what clinical features distinguish it from endometriosis and leiomyoma, and what gross and microscopic features are seen on hysterectomy?
  8. [PA29.9] What is the WHO two-tier classification of endometrial hyperplasia, what risk of progression to carcinoma separates non-atypical from atypical/EIN, and what clinical scenarios produce unopposed oestrogen exposure?
  9. [PA29.10] What are the key gross and microscopic features that allow practical identification of leiomyoma, DCIS, serous cystadenocarcinoma, mature cystic teratoma, and gestational trophoblastic disease on pathology slides?