Help. My pregnancy has a large yolk sac.

Ultrasound images in this 6 week gestation has a very large yolk sac on TVS scan. 

Transabdominal scan was not able to detect an embryo or yolk sac. 

Transvaginal ultrasound shows a yolk sac of 9mm.

Fetal cardiac activity was not seen. 

A very bad prognosis. 

Final diagnosis: 6 weeks pregnancy with non viable fetus. Follow up advised. 

More on such cases:

1. Ultrasound imaging can detect a very large yolk sac in a 6-week pregnancy, which is defined as a yolk sac diameter greater than 7mm.
2. A large yolk sac can indicate a higher risk of adverse outcomes, such as miscarriage or chromosomal abnormalities.
3. However, it is important to note that not all pregnancies with a large yolk sac will result in negative outcomes.
4. Prognosis and management depend on the individual case, but may involve close monitoring with serial ultrasounds and blood tests, as well as genetic counseling and consideration of invasive testing.
5. In some cases, a large yolk sac may spontaneously resolve, but in other cases, intervention such as fetal surgery or termination of the pregnancy may be necessary.
6. Overall, the presence of a large yolk sac in a 6-week pregnancy warrants careful evaluation and discussion with a healthcare provider.

For more on this topic:

Sonography of giant yolk sac