The sonographic appearance of fluid in the prevesical space.

Abstract
A fluid collection within the retropubic space has a characteristic sonographic contour which, when combined with a partially distended bladder, resembles a yoke over a bell. The fluid conforms to the anterior convexity of the bladder. This configuration is distinct from that of ascites or a lymphadenectomy-related lymphocele. [Post-operative sonographic findings in 2 cases of prostatic cancer are reported.].

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