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In contrast, tissues with lower echogenicity are called "hypoechoic" and are usually represented with darker colors. Areas that lack echogenicity are called "anechoic" and are usually displayed as completely dark. [1]
Infarct area shown as hypoechoic and avascular upper segment of R testis. Eye : an infarction can occur to the central retinal artery which supplies the retina causing sudden visual loss. Bowel : Bowel infarction is generally caused by mesenteric ischemia due to blockages in the arteries or veins that supply the bowel.
Suspicious findings in a nodule are hypoechoic, ill-defined margins, absence of peripheral halo or irregular margin, fine, punctate microcalcifications, presence of solid nodule, high levels of irregular blood flow within the nodule [11] or "taller-than-wide sign" (anterior-posterior diameter is greater than transverse diameter of a nodule).
In the normal kidney, the urinary collecting system in the renal sinus is not visible, but it creates a heteroechoic appearance with the interposed fat and vessels. The parenchyma is more hypoechoic and homogenous and is divided into the outermost cortex and the innermost and slightly less echogenic medullary pyramids.
Hypoxemia refers to the low level of oxygen in arterial blood. Tissue hypoxia refers to low levels of oxygen in the tissues of the body and the term hypoxia is a general term for low levels of oxygen. [2]
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Transvaginal ultrasonography of a hematometra after childbirth, seen as a hypoechoic (darker) area within the uterine cavity. The cervix is located to the left in the image, and the fundus is located to the right.