A 58-year-old woman presents to the emergency department with acute-onset severe groin pain and vomiting for 6 hours. On examination, she has a small, firm, tender mass below and lateral to the pubic tubercle in the right groin. Bowel sounds are present but high-pitched. She has no previous history of groin surgery. Abdominal examination reveals mild distension. What is the most likely diagnosis?

Explanation

## Clinical Presentation of Femoral Hernia Incarceration ### Key Anatomical Features **Key Point:** Femoral herniae present below and lateral to the pubic tubercle, below the inguinal ligament, distinguishing them from inguinal herniae which present above the inguinal ligament. **High-Yield:** Femoral herniae are more common in women (female:male ratio 4:1) due to the wider pelvic inlet and larger femoral canal. ### Why This Patient Has Femoral Hernia 1. **Location**: The mass is described as below and lateral to the pubic tubercle—this is the classic femoral hernia location (femoral canal, medial to femoral vein). 2. **Demographics**: Middle-aged to elderly women are at highest risk. 3. **Presentation**: Acute-onset pain with vomiting and high-pitched bowel sounds suggests bowel obstruction from incarceration—femoral herniae have the highest risk of incarceration among all abdominal wall herniae (20–40%). ### Femoral vs Inguinal Hernia: Key Distinctions | Feature | Femoral Hernia | Inguinal Hernia | |---------|---|---| | **Location** | Below inguinal ligament, medial to femoral vein | Above inguinal ligament | | **Relationship to pubic tubercle** | Below and lateral | Above and medial | | **Gender predilection** | Female (4:1) | Male (9:1) | | **Incarceration risk** | 20–40% (highest) | 10% | | **Contents** | Often bowel; omentum less common | Bowel, omentum, bladder | | **Presentation** | Often acute with obstruction | Often chronic, asymptomatic | **Clinical Pearl:** Femoral herniae are often small and easily missed on initial examination because they lie deep to the cribriform fascia. A high index of suspicion is needed in women with acute groin pain and obstruction symptoms. ### Management Implications **Key Point:** All femoral herniae should be repaired electively due to high incarceration risk, even if asymptomatic. Acute incarceration requires emergency surgery. **Mnemonic: FEMORAL HERNIA RISK — F**emale, **E**lderly, **M**ultiparity, **O**besity, **R**espiratory disease, **A**scites, **L** (chronic straining) [cite:Sabiston Textbook of Surgery Ch 43]