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The egg yolk is the yellow inside an egg. Its primary purpose is to serve as a food reserve for the developing embryo.

The egg yolk contains a small amount of fat and cholesterol, and people on a low-cholesterol diet may feel the need to cut down on egg consumption, although most of the fat in egg is unsaturated fat and may not be harmful. The egg white consists primarily of water (seven eighths) and protein (one eighth) and contains no cholesterol and little if any fat.

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Yolk sacThe yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation. It is a critical landmark, identifying a true gestation sac. It is quite echogenic (light) to ultrasound, and reliably seen early.

Yolk sac tumourYolk sac tumours are members of the germ cell tumour group of ovarian neoplasms. Almost all ovarian yolk sac tumours occur in women under the age of 30. Patients usually present with sudden onset pain and a large pelvic mass. Serum alpha-fetoprotein (AFP)

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