What technique is used to differentiate between solid and cystic lesions on ultrasound?

The technique used to differentiate between solid and cystic lesions on ultrasound involves assessing acoustic properties and the presence of internal echoes. Solid lesions typically reflect sound waves differently than cystic lesions, which are usually fluid-filled and have distinct acoustic properties.

Cystic lesions appear anechoic (dark on ultrasound) due to the fluid content, which does not generate echoes. In contrast, solid lesions often display internal echoes because they contain tissue, which reflects ultrasound waves back to the transducer. By evaluating these acoustic properties and any echoes present within the lesion, the sonographer can effectively determine whether the lesion is solid or cystic.

Other techniques, like assessing the motility of the lesion, viewing the patient in various positions, or utilizing Doppler imaging for blood flow measurement, are useful in different contexts on ultrasound but do not specifically address the differentiation between solid and cystic types. These methods might contribute to overall diagnostic evaluations but lack the direct relevance needed to differentiate the lesions in question.