sonographische Artefakte. Gb-Gallenblase. SV-distale Schallverstärkung; SA-distale Schallauslöschung; LS-lateral shadowing
lesions: a pictorial review. Incidentally found simple hepatic cyst in an asymptomatic 64-year-old male. a Ultrasonography shows a round homogeneous anechoic cystic hepatic lesion, well-circumscribed and without any mural nodule or vegetation. The arrows show an increased through transmission, confirming the cystic nature of the lesion. b T2-weighted magnetic resonance imaging shows a highly hyperintense round lesion. c and d Computed tomography without and with contrast on portal venous phase shows a round homogeneous non-enhancing hypoattenuating lesion (3 Hounsfield Units)
cyst • Simple breast cyst - Ganzer Fall bei Radiopaedia
enhancement • Posterior acoustic shadowing and enhancement - Ganzer Fall bei Radiopaedia
enhancement • Epidermal inclusion cyst (gluteal region) - Ganzer Fall bei Radiopaedia
Acoustic enhancement, also called posterior enhancement or enhanced through transmission, refers to the increased echoes deep to structures that transmit sound exceptionally well.
This is characteristic of fluid filled structures such as cysts, the urinary bladder and the gallbladder. The fluid only attenuates the sound less than the surrounding tissue. The time gain compensation (TGC) overcompensates through the fluid-filled structure causing deeper tissues to be brighter. Simply it is seen as increased echogenicity (whiteness) posterior to cystic area. The presence of acoustic enhancement aids in the identification of cystic masses but some solid masses, especially lymphoma, may also show acoustic enhancement posteriorly.