What does NVI stand for in medical terms?

In medical terms, NVI stands for "non-visualized inferior," which is often used in the context of imaging studies, particularly in echocardiography to describe parts of the heart or other structures that are not clearly seen in the images. It can also refer to "non-visualized intestine" in gastrointestinal studies. The specific meaning can vary depending on the clinical context in which it is used.