Urinary Tract, Dilated (Prenatal/Neonatal)

Figure 7 : Four instances of posterior urethral obstruction. A, Classic posterior valves, type I, the most common type. B-D, Posterior urethral membrane (type III valves). The membrane may be located just below the verumontanum (B) or at the level of the urogenital diaphragm (C), or it may be redundant (“windsock”) and herniate into the bulbous urethra (D).

Obstruction

The initial classification of PUV by Young and colleagues included three distinct types: Type I valves refer to the fused folds at the bottom of the verumontanum, type II valves extend from the verumontanum toward the bladder base, and type III valve ...

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