What are the normal ultrasound appearances?
On ultrasound imaging, the rectum typically appears as a hypoechoic (darker) structure surrounded by brighter echoes from the surrounding tissues.
The prostate gland appears as a well-defined, ovoid structure located anterior to the rectum. It typically has a heterogeneous appearance with both hypoechoic and hyperechoic areas.
The seminal vesicles, which are located on either side of the prostate gland, may also be visualized on ultrasound. They appear as paired, hypoechoic structures that are adjacent to the prostate.
The perirectal fat, which surrounds the rectum and prostate, appears as a hyperechoic layer that is brighter than the surrounding tissues.
Abnormalities, such as tumors or cysts, may appear as focal areas of hyperechogenicity or hypoechoic masses on ultrasound. These may be further evaluated with additional imaging studies or biopsies to determine their nature and extent.
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