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.

Extravasation of urine
SpecialtyUrology

Mechanism

An injury to the urethra leaving Buck's fascia 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.[1]

References
  1. Gild, Philipp; Kluth, Luis A.; Vetterlein, Malte W.; Engel, Oliver; Chun, Felix K.H.; Fisch, Margit (2018). "Adult iatrogenic ureteral injury and stricture–incidence and treatment strategies". Asian Journal of Urology. 5 (2): 101–106. doi:10.1016/j.ajur.2018.02.003. PMC 5934506. PMID 29736372.


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