Membranous urethral rupture causes collection of blood in
**Core Concept**
Membranous urethral rupture is a type of traumatic injury to the urethra, specifically involving the membranous part of the urethra that passes through the urogenital diaphragm. This injury can lead to bleeding and urine leakage, causing complications such as infection and stricture formation.
**Why the Correct Answer is Right**
In a membranous urethral rupture, the injury disrupts the integrity of the urethral wall, leading to bleeding from the surrounding tissues and the urethral lumen. The collection of blood is primarily in the perineal space, which is a potential space between the urogenital diaphragm and the superficial perineal pouch. This collection of blood can cause swelling and compression of nearby structures, leading to urinary retention and other complications.
**Why Each Wrong Option is Incorrect**
**Option A:** The blood collection in a membranous urethral rupture is not primarily in the scrotum, which would be a false diagnosis for this condition.
**Option B:** The blood collection is not in the femoral triangle, which is a different anatomical region located in the thigh.
**Option C:** The blood collection is not in the abdominal cavity, which would be a more severe and life-threatening condition known as a pelvic fracture or retroperitoneal hemorrhage.
**Clinical Pearl / High-Yield Fact**
In cases of suspected membranous urethral rupture, a retrograde urethrogram (RUG) is a crucial diagnostic tool to visualize the urethral injury and guide management.
**Correct Answer: D. Perineal space.**