The term I think you are looking for is "well circumscribed hypo-echoic nodule."
The phrase well circumscribed means that the item looked at has well defined edges. When talking about nodules or tumors in the body, it is generally a good thing.
The phrase hypo-echoic means that it did not reflect a lot of waves back to the sensor.
Since I have to assume you are seeing an ultrasound...the answer is no...it is not a nonviable pregnancy...in early pregnancy the conceptus in a horse is a circular ball that looks black in the center because it is fluid filled...as the conceptus changes into an embryo and subsequently a fetus it be comes white because the tissue is hyper-echoic (white) as opposed to hypo-echoic (black) fluid.
What is Hypoechoic to Isoechoic Nodule
I am not use what it means when been circumcised as a large. When a boy is born they parents have a choice to get him circumcised.
Dehydration.
Hyper - higher than normal Hypo - lower than normal
There's blood supply inside of it not just leading to it
Thyroid cysts are nodules filled with fluid. They can be small or large. If a nodule has both solid and fluid parts, it is called a complex nodule, and need to be removed if they cause pain or difficulty when swallowing.
A thyroid nodule is simply a mass in your thyroid. Hyperechoic is a term used in ultrasound which determines how bright or dark the nodule is. Ultrasound is all black, white, and gray scales, so a hyperechoic nodule would be a mass in the thyroid that is BRIGHTER than the rest of the thyroid tissue.
The prefix "hypo-" means below, beneath, or deficient, often used to indicate a lower quantity or intensity.
The Greek prefix "hypo-" has several meanings: under, below, less than, smaller, etc.
In medical terms, a nodule is a lump that appears on the skin. It is classed as a nodule when it reaches 0.5 centimetres in size. Nodules can appear anywhere on the body.
hypo means less than normal, or deficient, so hypo-volition would mean a less than normal, or deficient ability, to make a conscious choice or decision