A Little about Lumps
July 4th, 2009A common presentation, and a perennial short-case favourite in surgery, is the groin lump, which in all probability allows a platform for the distinction, specifically, of the inguinal hernia, from the femoral hernia. This subject allows for an exploration of the anatomy from a clinical, surgical, or somewhat theoretical level, and as such will serve well for a brief yet important discussion here.
A hernia, for those with a perchant for definitions, is the protrusion of any organ or tissue though an opening in its surrounding walls. First, some basic anatomical distinctions:
The Inguinal Hernia
A great Powerpoint Presentation on Inguinal Hernias, from St Barnabas Hospital NY (site), can be found here.
It is important, when discussing inguinal hernias, to distinguish between direct and indirect hernias. The former will pass through Hesselbach’s Triangle, the latter will pass lateral to it.
Rather than to profess an intimate knowledge of the exact anatomy of said hernia, I must admit that i possess no such knowledge, but really should. Hence I will make an addendum to this posting within the week, once I myself are comfortable with the anatomy of the hernia. Unless someone wants to comment, and beat me to it.
The Femoral Hernia
Occur within the femoral triangle, bordered by the inguinal ligament superiorly, the medial border of adductor longus medially, and the medial border of sartorius laterally.
It contains the femoral nerve, artery and vein (laterally to medially). The femoral canal (wiki) is the point at which a protrusion of bowel or associated tissues may occur, creating a femoral hernia. This herniation hence sits between the lacunar ligament (medial) and the femoral vein (lateral).
This position also means that the hernia is occuring inferolaterally to the pubic tubercle.
Demographics
Males are more likely to develop inguinal hernias than females (9:1), with a lifetime risk of up to 27%. Females, particularly elderly, are more likely than males to develop femoral hernias (3:1).
A brief yet mildly useful summary of the hernia examination, can be found here. Perhaps not very complete, but the links contained within the page give some nice mnemonics for remembering the anatomy.
De Garangeot’s Hernia
I mention this simply because I was fortunate enough to come across one (though I cannot take credit for diagnosing it!). I discussed this in SynapseBlog late last year (Conversation Starter, 27Nov08). This is a rare complication of femoral hernia, when the appendix becomes incarcerated within the hernia, and hence develops appendicitis.
Perforated Appendix within a Femoral Hernia (AJR Online, 2006)
A brief yet interesting case study of this rare occurence, complete with some spectacular CT imagery.

















The second story also refers to Health Minister Daniel Andrew’s response to the matter, and one has to wonder: Was this dramatically labelled “health system overhaul”, a response to the original report, or the fact that it had begun to surface in the media?