Mixed germ cell tumour
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Mixed germ cell tumour is a tumour composed on different germ cell tumours. Most germ cell tumours are mixed.
| Mixed germ cell tumour | |
|---|---|
| Diagnosis in short | |
 Mixed germ cell tumour. H&E stain. | |
|
| |
| LM | depends on the components |
| LM DDx | other germ cell tumours |
| IHC | variable |
| Site | ovary, testis, mediastinum, other |
|
| |
| Signs | mass |
General=
- 60% of GCTs are mixed.
Common combinations:
- Teratoma + embryonal carcinoma + endodermal sinus tumour (yolk sac tumour) (TEE).
- Seminoma + embryonal (SE).
- Teratoma + embryonal +(TE).
Memory device: TEE + all combinations have embryonal carcinoma.
Microscopic
Features:
- Depends on components.
Notes:
- If one cannot identify the component... it is probably yolk sac as this has so many different patterns.
Images
Mixed GCT - intermed mag. (WC/Nephron)
Mixed GCT - high mag. (WC/Nephron)
www:
- Mixed germ cell tumour - several images (upmc.edu).
- Mixed germ cell tumour - several cases (upmc.edu).
IHC
- Beta-hCG +ve - if syncytiotrophoblasts are present.
- AFP +ve - a yolk sac tumour component is present.
- GFAP +ve - if neuroepithelium is present.