Extravasation of urine refers to the condition where an interruption of the
urethra leads to a collection of
urine in other cavities, such as the
scrotum or the
penis in males. It can be associated with a
calculus.
Mechanism
An injury to the urethra leaving
Buck's fascia
Buck's fascia (deep fascia of the penis, Gallaudet's fascia or fascia of the penis) is a layer of deep fascia covering the three erectile bodies of the penis.
Structure
Buck's fascia is continuous with the external spermatic fascia in the scrotu ...
intact results in a collection of urine (extravasation) limited to the penis, deep to Buck's fascia. However, if the injury to the bulb of the penis results in urethral injury accompanying a tear of the Buck's fascia, then extravasated blood and urine would accumulate in the superficial perineal space, passing into the penis (outer to Buck's fascia) as well as the scrotum and lower anterior abdominal wall. Extravasation of urine involving a compromised Buck's fascia can be appreciated clinically by blood collecting in the superficial pouch, resulting in a 'butterfly'-shaped region around the penis.
Urinoma
Long term complications of renal trauma, ureteral obstruction, or
kidney transplant can lead to the formation of an urinoma encapsulating extravasated urine.
References
External links
Symptoms and signs: Urinary system
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