Which is true about indirect inguinal hernia –
**Core Concept**
Indirect inguinal hernias occur through the deep inguinal ring and pass through the inguinal canal, often associated with a patent processus vaginalis, which is a remnant of the peritoneal sac that usually obliterates during fetal development.
**Why the Correct Answer is Right**
The correct answer is related to the embryological origin of indirect inguinal hernias. Indirect inguinal hernias result from a failure of closure of the processus vaginalis, which is a peritoneal diverticulum that extends from the abdominal cavity to the scrotum during fetal development. The processus vaginalis usually obliterates and disappears by the 9th week of gestation, but in cases where it remains patent, it can provide a pathway for herniation of abdominal contents through the inguinal canal.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because direct inguinal hernias occur through the posterior wall of the inguinal canal, not through the deep inguinal ring.
**Option B:** This option is incorrect because femoral hernias occur through the femoral canal, which is located below the inguinal ligament, not through the inguinal canal.
**Option C:** This option is incorrect because lumbar hernias occur through defects in the posterior abdominal wall, not through the inguinal canal.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that indirect inguinal hernias are more common in men due to the longer length of the inguinal canal and the presence of a processus vaginalis, which increases the risk of herniation.
**Correct Answer:** C.