Extravasation of urine
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 Bucks fascia intact results in a collection of urine (extravasation) limited to the penis, deep to Bucks fascia. However, if the injury to the bulb of the penis results in urethral injury accompanying a tear of the Bucks fascia, then extravasated blood and urine would accumulate in the superficial perineal space, passing into the penis (outer to Bucks fascia) as well as the scrotum and lower anterior abdominal wall. Extravasation of urine involving a compromised Bucks 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.

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