Merck Manual

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Anechoic areas within the parenchyma, transabdominal ultrasonography
Anechoic areas within the parenchyma, transabdominal ultrasonography
Anechoic areas within the parenchyma, transabdominal ultrasonography

Transabdominal ultrasonography is the best imaging modality for evaluation of the prostate because it allows for evaluation of the prostatic parenchyma. Both large (A) and small (B) intraprostatic cysts appear as anechoic areas with the parenchyma.

Courtesy of Dr. Michelle Kutzler.