Definition
It is a germ cell tumour that differentiates to resemble extraembryonic structures including the YST, allantois, and extraembryonic mesenchyme. It is not associated with GCNIS.
Clinical Features
Incidence
The pure form of yolk sac tumor (YST) is the most frequent (80%) GCT of childhood with and estimated incidence of 2–3 cases per year per 1 million children through age 6 years. The average patient age is about 18 months, since most tumors arise in the first 2 years of life. The epidemiologic data about possible racial preferences are contradictory. In some reports, the incidence is equal in black and white children, whereas in other reports, it is just as with adults, namely, white children and Indian prevail.
Age
YST prepubertal type develops at a median age of 16–20 months with very rare cases beyond 6 years.
Site
This tumor occurs in the testis.
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References and Further Reading
Grady, R. W., Ross, J. H., & Kay, R. (1995). Patterns of metastatic spread in prepubertal yolk sac tumor of the testis. Journal of Urology, 153(4), 1259–1261.
Kaplan, G. W., Cromie, W. C., Kelalis, P. P., Silber, I., & Tank, E. S., Jr. (1988). Prepubertal yolk sac testicular tumors-report of the testicular tumor registry. Journal of Urology, 140(5 Pt 2), 1109–1112.
Oosterhuis, J. W., Stoop, J. A., Rijlaarsdam, M. A., Biermann, K., Smit, V. T., Hersmus, R., & Looijenga, L. H. (2015). Pediatric germ cell tumors presenting beyond childhood? Andrology, 3(1), 70–77.
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Colecchia, M., Bertolotti, A. (2019). Yolk Sac Tumor, Prepubertal-Type. In: van Krieken, J. (eds) Encyclopedia of Pathology. Encyclopedia of Pathology. Springer, Cham. https://doi.org/10.1007/978-3-319-28845-1_4998-1
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DOI: https://doi.org/10.1007/978-3-319-28845-1_4998-1
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