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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]
These results prove that for a correct characterization of the lesions it is necessary to extend the examination time to 5 minutes or even longer. [citation needed] Fig. 11. Early hepatocellular carcinoma (2D, CFM). The 2D examination reveals a solid, hypoechoic nodule in IVth liver segment, without encapsulation.
The simple cyst is a benign lesion, which does not require further evaluation. [1] ... Solid tumor in the renal sinus seen as a hypoechoic mass, later found to be ...
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.
As the lesion liquefies, a hypoechoic centre is developed. At last, the lesion would become entirely anechoic, with or without septations. Color Doppler could be used to confirm the absence of associated intrinsic vascularity of the lesion at different stages. Besides, the adrenal hematoma might calcify during the resolution phase, and the ...
A chorionic hematoma appears on ultrasound as a hypoechoic crescent adjacent to the gestational sac. The hematoma is considered small if it is under 20% of the size of the sac and large if it is over 50%. [2]
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Features of benign lesion are: hyperechoic, having coarse, dysmorphic or curvilinear calcifications, comet tail artifact (reflection of a highly calcified object), absence of blood flow in the nodule, and presence of cystic (fluid-filled) nodule. However, the presence of solitary or multiple nodules is not a good predictor of malignancy.