Hydatidiform mole pathology slide labelling
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Hydatidiform Mole - Pathology Slide Labelling
Gross Pathology
Complete Hydatidiform Mole - Gross Appearance (Fig. 22.54A - Robbins):
Panel A (Gross): The uterus is markedly distended. The cavity is filled entirely with vesicular, grape-like structures - these are the swollen hydropic chorionic villi. The adnexa (ovaries and fallopian tubes) are visible flanking the uterus. No fetal parts are identified (in a complete mole).
Panel B (Histology, H&E): Microscopic features of a complete hydatidiform mole - see labelling below.
Histology Slide Labelling
Complete Mole (H&E - Low Power)
Panel A = Complete mole | Panel B = Normal placenta (co-twin, for comparison)
Labels to identify on Complete Mole slide:
| Structure | What to Look For | Significance |
|---|---|---|
| 1. Enlarged/Hydropic Chorionic Villi | Large, pale, swollen villous structures - all villi affected | Central feature; "cistern" = central acellular lake within the villus |
| 2. Central Cistern (Cisterna) | Clear, empty central space within the villus stroma | Hallmark of complete mole; represents myxoid/edematous degeneration |
| 3. Circumferential Trophoblastic Proliferation | Rim of trophoblastic cells surrounding the entire villous surface | KEY distinguishing feature - involves the entire circumference (360°) |
| 4. Cytotrophoblasts | Inner layer of trophoblast - polygonal cells with clear cytoplasm, distinct cell borders | Part of the biphasic trophoblastic proliferation |
| 5. Syncytiotrophoblasts | Outer layer - multinucleated giant cells with dense eosinophilic cytoplasm | Part of the biphasic trophoblastic proliferation |
| 6. Avascular Villous Stroma | Stroma is edematous with NO fetal/embryonic blood vessels | Distinguishes complete mole from partial mole (which may have fetal vessels) |
| 7. Absent Fetal Parts | No nucleated fetal RBCs, no embryonic tissue | Characteristic of complete mole |
Partial Mole (H&E)
Labels to identify on Partial Mole slide:
| Structure | What to Look For | Significance |
|---|---|---|
| 1. Two Villous Populations | Mix of large hydropic villi AND small normal-sized villi | KEY feature - only a subset of villi are enlarged (unlike complete mole) |
| 2. Irregular/Scalloped Villous Outlines | Villi with jagged, indented, fjord-like contours | Hallmark of partial mole; complete moles have smooth, round outlines |
| 3. Trophoblastic Inclusions | Invaginations of trophoblast into the villous stroma, forming enclosed "islands" | Prominent in partial mole; results from irregular surface folding |
| 4. Focal Trophoblastic Hyperplasia | Trophoblast proliferation is patchy, not circumferential | Only syncytiotrophoblasts are hyperplastic (cytotrophoblast NOT hyperplastic) |
| 5. Fetal Blood Vessels | Nucleated fetal RBCs may be present within villous vessels | Indicates early fetal development was initiated (triploid pregnancy) |
| 6. Syncytiotrophoblast Hyperplasia | Irregular buds of syncytium at villous surface | Focal, not diffuse as in complete mole |
Side-by-Side Comparison Table
| Feature | Complete Mole | Partial Mole |
|---|---|---|
| Karyotype | 46,XX (or 46,XY) - Diploid | 69,XXY - Triploid |
| Villous edema | All villi enlarged | Only some villi enlarged |
| Villous outlines | Smooth, round | Irregular, scalloped |
| Trophoblast proliferation | Diffuse, circumferential (both cyto + syncytio) | Focal, syncytiotrophoblast only |
| Cistern formation | Prominent | Less prominent |
| Trophoblastic inclusions | Absent/rare | Prominent |
| Fetal blood vessels | Absent | May be present |
| Embryo/fetus | Absent | May be present (anomalous) |
| hCG levels | Very high | Less elevated |
| Risk of choriocarcinoma | 2.5% | Rare |
Gross Mole Specimen (for comparison)
Panel A: Gross specimen showing the molar component (large, right) alongside a normal placenta (left, co-twin). Panel B: Close-up of the molar component showing the classic translucent, grape-like cystic vesicles (hydropic villi).
Memory Aid for Slide Recognition
- Complete mole: Think "Complete = Circumferential trophoblast, Central cistern, Clean/smooth villi, Chromosomal = diploid"
- Partial mole: Think "Partial = Population mix (two types), Polyploid (triploid), Peculiar scalloped outlines, Pseudo-inclusions (trophoblastic)"
Sources: Robbins, Cotran & Kumar Pathologic Basis of Disease (Fig. 22.54, 22.55); Robbins & Kumar Basic Pathology (Table 17.5); Creasy & Resnik's Maternal-Fetal Medicine (Fig. 5.14, 5.15)
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