What Is a Hypoechoic Lesion?

When sound waves pass through, an acoustic interface is formed between the two tissues, and different echo areas appear. Common are high echo, iso-echo, low echo, no echo.

Low echo area

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When sound waves pass through, an acoustic interface is formed between the two tissues, and different echo areas appear. Common are high echo, iso-echo, low echo, no echo.
Chinese name
Low echo area
The principle of B-ultrasound
Take advantage of different acoustic impedances of different tissues
Image characteristics
Cystic and parenchymal lesions
Clinical significance
Hyperechoic areas are mostly malignant tumors,
Different tissues have different densities and their sound waves are attenuated to different degrees, thus reflecting normal or abnormal tissues. The higher the echo, the greater the tissue density. The low-echo ultrasound image is darker, and the high-echo ultrasound image is brighter. The non-echo is black, which represents liquid areas, including blood, bile, urine, etc.
1 Description of echo strength: Echo signals are divided into different gray levels in the image
Ultrasound has a significant image difference between liquid and parenchyma, so it is easy to distinguish.
2 Homogeneous and heterogeneous lesions
Homogeneous lesions have uniform low echo, isoechoic or strong echo, while heterogeneous lesions have complex echo structure.
3 Calcified and gaseous lesions
The image of calcified lesions is stable, the sound and shadow are clear, the image of gaseous lesions is unstable, and the sound and shadow are muddy.
4 Inflammatory and fibrotic lesions
In the early stage of acute inflammation, edema is predominant, local echo is reduced, organs are swollen, and meridian values are increased. Chronic inflammatory fibrous tissue is increased, and echoes are enlarged.
Fibrotic lesions are mostly echogenic and behave differently depending on the extent of the lesion. Such as schistosomiasis liver fibrosis is a typical "map" -like changes.
5 Benign and malignant lesions
Generally speaking, benign lesions have a uniform texture and a single interface, so the echoes are uniform and regular. Malignant lesions are characterized by rapid growth, accompanied by bleeding, degeneration, and complex and uneven tissue interface in the tumor, showing irregular echo structure.
Such as (1) tumor edge: Yes: benign or malignant does not stretch outward; False edge: halo, buffalo eyes; rules: benign and malignant; clear boundaries: more benign; Pseudofoot extension: Malignant as much.
(2) Internal echo: uniform: benign; uneven: greater malignant. But mild pancreatitis is hypoechoic, and severe pancreatitis is thick and strong echo
(3) Other internal structures: Normal: mostly benign; Abnormal: mostly malignant.
(4) Rear echo: normal or enhanced: mostly benign; normal or weakened: mostly malignant.
(5) Invasion or metastasis: Blockage or invasion of ducts, proliferation or metastasis of nearby tissues and / or organs are considered malignant. By Badong Tan Fengyuan

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