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Upper GI Surgery - Comprehensive Topic Guide

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1. Acid Peptic Disease (APD)

Definition

Conditions under APD

• Gastroesophageal reflux disease (GERD)
• Acute erosive gastritis
• Peptic ulcer disease (gastric and duodenal ulcers)
• Zollinger-Ellison syndrome (gastrinoma)

Pathophysiology - Imbalance Theory

Gastric Acid Secretion Pathway

• Neural stimulus: Vagus nerve releases acetylcholine (ACh) on parietal cells and ECL cells
• Hormonal stimulus: Gastrin (from G cells of antrum) acts on parietal cells and ECL cells
• Paracrine stimulus: Histamine (from ECL cells) binds H2 receptors on parietal cells
• Final pathway: All three stimuli activate H+/K+ ATPase (proton pump) on parietal cells - secretes H+ into stomach lumen

Pharmacological Targets

• PPIs (Omeprazole, Pantoprazole): Block H+/K+ ATPase - most potent acid suppressants
• H2 blockers (Ranitidine, Famotidine): Block histamine H2 receptor
• Antacids (Mg(OH)2, Al(OH)3): Neutralize secreted acid
• Sucralfate: Mucosal barrier enhancer
• Misoprostol: Prostaglandin analog - protective

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2. Peptic Ulcer Disease (PUD)

Definition

Epidemiology

• Duodenal ulcers (DU) are 3-4x more common than gastric ulcers (GU)
• Peak age: DU = 30-50 years; GU = 50-70 years
• Male predominance for DU

Etiology

1. H. pylori infection - most important cause (95% DU, 70-80% GU)
2. NSAIDs/Aspirin - inhibit COX-1, reduce protective prostaglandins
3. Zollinger-Ellison syndrome - gastrinoma causes extreme acid hypersecretion
4. Smoking, alcohol, stress (corticosteroids)

Common Sites

• Duodenum: First part (anterior wall more likely to perforate; posterior wall more likely to bleed)
• Stomach: Lesser curvature, antrum, prepyloric region
• Also: Stoma (stomal ulcer), Meckel's diverticulum (ectopic gastric mucosa)

Symptoms

• Duodenal ulcer: Epigastric pain 2-3 hours after meals, relieved by food ("hunger pain"), night pain, water brash
• Gastric ulcer: Epigastric pain shortly after meals, NOT relieved by food (sometimes worsened)
• Nausea, heartburn, bloating

Investigations

1. Endoscopy (OGD): Gold standard - allows biopsy to exclude malignancy (mandatory for gastric ulcers)
2. Barium meal (double contrast): Shows "niche" sign for ulcer
3. H. pylori testing: Urea breath test (non-invasive, gold standard), stool antigen, serology, rapid urease test (CLO test on biopsy), histology (Giemsa stain)
4. Blood: CBC (anemia), serum gastrin (to exclude ZE syndrome)

Medical Treatment

1. PPI (Omeprazole 20-40 mg BD) for 4-8 weeks
2. H. pylori eradication if positive (see H. pylori section below)
3. Stop NSAIDs
4. Smoking cessation

Surgical Treatment (rare now - for complications only)

• Billroth I (gastroduodenostomy)
• Billroth II / Polya gastrectomy (gastrojejunostomy)
• Vagotomy + drainage (truncal/selective/highly selective)

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3. Peptic Ulcer: Complications

A. Perforation (See dedicated section below)

B. Hemorrhage / Bleeding

• Most common complication
• Posterior wall duodenal ulcers erode the gastroduodenal artery (GDA)
• Presents with: Hematemesis (vomiting blood), Melena (black tarry stool), or hematochezia if massive
• Rockall Score and Blatchford Score used to assess severity
• Management:
  • Resuscitation (IV fluids, blood transfusion)
  • Urgent OGD (endoscopic hemostasis: injection of adrenaline, thermal coagulation, clipping)
  • Intravenous PPI (Omeprazole 80mg bolus + 8mg/h infusion)
  • Surgical: Underrunning of the bleeding vessel if endoscopy fails

C. Pyloric Stenosis (Gastric Outlet Obstruction)

• Chronic ulceration/fibrosis of pylorus/first part of duodenum
• Presents with: Projectile non-bilious vomiting of undigested food, "succussion splash," loss of weight
• Metabolic effect: Hypochloraemic, hypokalaemic metabolic alkalosis (loss of HCl) - the body corrects pH by retaining H+ and excreting K+ in urine (paradoxical aciduria)
• Investigation: Endoscopy (shows food residue + narrow pylorus), barium meal (dilated stomach + "bird's beak")
• Treatment: Correction of electrolytes first, then surgery (pyloroplasty, gastrojejunostomy, or gastrectomy)

D. Malignant Transformation

• Only gastric ulcers can undergo malignant change
• Duodenal ulcers do NOT become malignant
• All gastric ulcers must have biopsy at diagnosis and at follow-up (6-8 weeks after treatment)

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4. Perforated Peptic Ulcer

Definition

Site

• Anterior wall of first part of duodenum (most common perforation site)
• Anterior wall of stomach (gastric perforation)
• Note: Posterior ulcers bleed (into pancreas/GDA), Anterior ulcers perforate

Presentation

• Sudden, severe, "board-like" epigastric pain - patient can often specify the exact time of onset
• Pain rapidly becomes generalized
• Patient lies still, afraid to move (peritonism)
• Tachycardia, hypotension in shock
• Abdomen: Rigid, tender, absent bowel sounds
• "Three-phase" progression: Peritoneal irritation (chemical) → Temporary improvement (peritoneal adaptation) → Bacterial peritonitis and septic shock

Investigations

1. Erect Chest X-ray (ECR): Free gas under the diaphragm (pneumoperitoneum) - seen in >75% cases
2. CT abdomen: Most accurate; shows free air, edema around duodenum/antrum, peritoneal fluid - diagnostic in ~98%
3. Serum amylase: Can be mildly elevated (don't confuse with pancreatitis)
4. Blood: WBC elevated, ABG for base deficit, LFT, RFT, blood group and cross-match
5. Caution: Endoscopy is CONTRAINDICATED when perforation is suspected (air insufflation can convert sealed to free perforation)

Conservative Management (Taylor's Method)

• Used in selected stable patients (sealed/contained perforation, hemodynamically stable)
• Strict NBM + nasogastric suction
• IV fluids, IV PPI, broad-spectrum antibiotics
• Close monitoring; if no improvement in 6-12 hours, operate

Surgical Management

1. Laparotomy (upper midline incision) or laparoscopy
2. Peritoneal toilet: Thorough washout to remove fluid and food debris (critical step)
3. For duodenal perforation:
   • Graham's omental patch repair: Two or three sutures through ulcer edges + omental patch placed over + secured (most common)
   • Simple suture closure in transverse direction
4. For gastric perforation:
   • Excision of ulcer + closure (to exclude malignancy)
   • If too large: Distal gastrectomy + Roux-en-Y reconstruction
5. Postoperatively: NG suction, PPI, H. pylori eradication mandatory

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5. Duodenal Ulcer (DU)

Pathophysiology (Why Duodenum is Affected)

• Increased acid output (basal acid output and maximal acid output both higher than normal)
• H. pylori colonizes antrum → ammonia production → inhibits D cells (stops somatostatin) → hypergastrinemia → hypersecretion of acid
• More parietal cells (increased parietal cell mass)
• Rapid gastric emptying → duodenum not buffered adequately

Duodenal Ulcer vs. Gastric Ulcer (Classic Exam Comparison)

"Kissing Ulcers"

• When both anterior and posterior walls of the duodenum are simultaneously ulcerated

Complications Specific to DU

• Perforation (anterior wall DU)
• Hemorrhage from GDA (posterior wall DU) - can cause catastrophic bleeding
• Pyloric stenosis

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6. Duodenal Ulcer Perforation

Specific Points for Duodenal Perforation

• Site: Anterior wall of 1st part of duodenum (most common site for all peptic perforations)
• Perforation into the free peritoneal cavity - gastric contents leak freely
• Blood supply at risk: GDA lies posterior, so posterior DU bleeds but anterior DU perforates
• Repair: Graham's omental patch or suture closure ± patch
• H. pylori eradication post-repair reduces recurrence from ~60% to <5%

Duodenal Fistula

• A fistula is an abnormal connection between the duodenum and another organ or the skin
• Types:
  • External (duodenocutaneous fistula): After surgery or drainage of duodenal abscess/perforation
  • Internal: Duodeno-colic (between duodenum and colon), duodeno-biliary
• Causes: Perforated posterior DU, post-surgical leak (duodenal stump blowout after gastrectomy), Crohn's disease, trauma
• Duodenal stump blowout is a feared complication of Billroth II gastrectomy
• Management:
  • NBM, NG suction, IV fluids and nutrition (TPN)
  • Proton pump inhibitors, somatostatin analog (Octreotide) to reduce secretions
  • Treat infection
  • Many close spontaneously with conservative management
  • Surgery if persistent: definitive repair or exclusion procedures

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7. Gastric Perforation

Characteristics Distinguishing Gastric from Duodenal Perforation

• Less common than duodenal perforation
• Site: Anterior wall of stomach (lesser curvature, antrum)
• Key concern: Must exclude malignancy - gastric ulcer may be a perforated cancer
• Therefore, ulcer should be excised (not just patched) and sent for histology
• If malignancy confirmed on frozen section and patient can tolerate, consider partial/total gastrectomy

Specific Management

• Resuscitation and exploration
• Excision of ulcer margin + closure
• If massive: Distal gastrectomy (Polya or Roux-en-Y)
• All specimens sent for histology

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8. Helicobacter pylori (H. pylori)

Overview

• A Gram-negative, microaerophilic, spiral-shaped (helical) bacillus
• Discovered by Barry Marshall and Robin Warren (1983) - won Nobel Prize in 2005
• Causes: Chronic (Type B) gastritis, PUD, MALT lymphoma, gastric adenocarcinoma

Pathogenesis

1. H. pylori colonizes the mucus layer overlying the gastric epithelium
2. It produces urease → splits urea into ammonia (NH3) + CO2
3. Ammonia creates an alkaline microenvironment, allowing survival in acid
4. Ammonia disrupts the gastric mucous barrier
5. Ammonia causes negative feedback on antral D cells (less somatostatin) → excess gastrin (G cells) → acid hypersecretion
6. Virulence factors: CagA (cytotoxin-associated gene A) and VacA (vacuolating cytotoxin) - strains producing these are more pathogenic (cause gastritis, peptic ulcer, cancer)

Epidemiology

• Transmission: Feco-oral, oral-oral (contaminated water/food)
• Higher prevalence in developing countries (>70% of adults infected)
• Risk factor for: Gastric cancer, MALT lymphoma (marginal zone B cell lymphoma)

Diagnosis Methods

H. pylori Eradication Therapy (Triple Therapy)

• PPI (Omeprazole 20mg BD) +
• Clarithromycin 500mg BD +
• Amoxicillin 1g BD

• PPI + Clarithromycin + Metronidazole

• PPI + Bismuth + Tetracycline + Metronidazole (for 10-14 days)

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9. Upper GI Bleed (UGIB)

Definition

Causes

• Peptic ulcer disease (most common - 35-50%)
• Erosive gastritis/duodenitis
• Mallory-Weiss tear (longitudinal mucosal tear at GOJ, typically after retching)
• Dieulafoy's lesion (abnormally large submucosal artery)
• Gastric cancer
• Aortoenteric fistula

• Esophageal varices (cirrhosis, portal hypertension) - HIGH mortality
• Gastric varices

Presentation

• Hematemesis: Vomiting bright red blood (fresh) or "coffee-ground" vomitus (digested blood)
• Melena: Black, tarry, offensive-smelling stools (requires >100-200 mL blood in upper GI tract)
• Hematochezia (bright red PR bleeding) if massive
• Dizziness, syncope, shock

Initial Assessment & Resuscitation (ABCDE)

1. Two large-bore IV cannulae
2. IV crystalloid resuscitation; blood transfusion if Hb < 7 g/dL (target 7-9)
3. NBM + NG tube
4. IV PPI bolus + infusion
5. Coagulation correction (FFP, platelets if needed)
6. In varices: Terlipressin (vasopressin analog) + prophylactic antibiotics (Ceftriaxone)

Scoring Systems

• Rockall Score (pre- and post-endoscopy): predicts risk of rebleeding and mortality
• Blatchford Score (pre-endoscopy): predicts need for intervention

Investigation

• Urgent OGD (within 24 hours for non-variceal; within 12 hours for variceal or high risk)
• CBC, coagulation, LFT, RFT, blood group, crossmatch

Endoscopic Treatment

• Adrenaline injection (diluted 1:10,000) around bleeding point
• Thermal coagulation (heater probe, argon plasma coagulation)
• Endoscopic clipping
• Band ligation (for varices)
• TIPS (transjugular intrahepatic portosystemic shunt) for refractory variceal bleeding

Surgery (if endoscopy fails)

• Underrunning of bleeding vessel (posterior DU eroding GDA)
• Partial gastrectomy

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10. Erosive Gastritis

Definition

Causes

1. Stress ulceration - most common cause in critically ill patients (burns, sepsis, trauma, mechanical ventilation, head injury)
2. NSAIDs/Aspirin - inhibit COX-1 → reduce prostaglandins → impaired mucus and bicarbonate
3. Alcohol - direct mucosal injury
4. Corticosteroids (especially combined with NSAIDs)
5. H. pylori (usually causes antral gastritis rather than erosive)

Pathogenesis in Stress

• Severe illness → splanchnic hypoperfusion → ischemia of gastric mucosa → breakdown of mucosal barrier → acid injury → erosions

Clinical Features

• Usually asymptomatic (incidental finding on endoscopy)
• May present as upper GI bleed (hematemesis/melena)

Endoscopy Findings

• Multiple, small, superficial erosions (often with surrounding erythema and hemorrhagic spots) in the body and fundus
• "Stress erosions" tend to be flat and hemorrhagic

Treatment

• Treat underlying cause
• Prophylaxis in ICU patients (prevent, don't just treat): IV/oral PPI or H2 blocker
• If bleeding: IV PPI, endoscopic hemostasis
• Stop NSAIDs/alcohol
• Sucralfate as mucosal protectant

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11. Type A Gastritis (Autoimmune Gastritis)

Definition

Pathogenesis

• Autoantibodies against:
  1. Parietal cells (anti-parietal cell antibodies) - destroys parietal cells → loss of acid and intrinsic factor (IF) production
  2. Intrinsic factor (anti-IF antibodies) - blocks IF → cannot absorb Vitamin B12 from terminal ileum

Consequences

1. Achlorhydria (no HCl) → hypergastrinemia (antral G cells overactivated due to absent acid negative feedback) → ECL cell hyperplasia (carcinoid tumors can develop)
2. Loss of intrinsic factor → Vitamin B12 deficiency → Pernicious anemia (megaloblastic anemia)
3. Gastric atrophy → Intestinal metaplasia → Risk of gastric adenocarcinoma (3-5x increased risk)

Type A vs. Type B Gastritis (Classic Comparison)

Clinical Features

• Fatigue, pallor (megaloblastic anemia)
• Peripheral neuropathy, subacute combined degeneration of cord (B12 deficiency neuro complications)
• Glossitis, angular cheilitis
• Schilling test (historical) confirmed B12 malabsorption due to lack of IF

Treatment

• Vitamin B12 replacement: IM Hydroxocobalamin 1mg every 3 months lifelong (or daily oral B12 if no IF issue)
• Endoscopic surveillance for gastric cancer
• Monitor for carcinoid development

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12. Carcinoma Stomach

Histological Types

• Adenocarcinoma (95%) - most common
• Lymphoma (5%) - MALT lymphoma, diffuse large B-cell lymphoma
• GISTs (gastrointestinal stromal tumors)
• Carcinoid tumors

Etiopathogenesis (Correa Cascade - most accepted for intestinal type)

• Intestinal type: Forms polypoid tumors or ulcers; arises in intestinal metaplasia; better prognosis; associated with environmental factors/H. pylori
• Diffuse type: Infiltrative growth; signet ring cells; "linitis plastica" (leather bottle stomach) if whole stomach involved; worse prognosis; more genetic basis; NOT associated with H. pylori

Spread

1. Direct: To adjacent structures (pancreas, transverse colon, liver)
2. Lymphatic: To regional nodes (perigastric) then distant
   • Virchow's node: Left supraclavicular node (Troisier's sign)
3. Transcoelomic (peritoneal): Krukenberg tumor (ovarian metastasis via peritoneum), Blumer's shelf (pouch of Douglas deposits)
4. Hematogenous: Liver (most common organ), lung, adrenals
5. Sister Mary Joseph's nodule (umbilical metastasis - see below)

Clinical Features

• Dysphagia (proximal tumors)
• Epigastric pain, early satiety
• Vomiting (pyloric obstruction)
• Weight loss, anorexia
• Iron-deficiency anemia (chronic blood loss)
• Palpable epigastric mass (late)
• Trousseau's sign (migratory thrombophlebitis)
• Jaundice (liver metastases)

Investigations

1. OGD + Biopsy: Gold standard - multiple biopsies (at least 8) from ulcer edge; identifies tumor type
2. Barium swallow/meal: "Rat-tail/shouldering" appearance; "Filling defect" for polypoid; "leather bottle" for linitis plastica

1. CT chest/abdomen/pelvis (with oral + IV contrast): Detects primary, lymph nodes, liver metastases, ascites
2. Endoscopic Ultrasound (EUS): Best for T (depth) and N staging; guides FNA of suspicious nodes
3. PET scan: Detects occult distant metastases; monitors response to neoadjuvant chemo
4. Staging laparoscopy: Detects peritoneal and hepatic micrometastases missed on CT (recommended for all T2+ disease); peritoneal washings for cytology
5. MRI: If CT inconclusive for liver metastases

• HER2 testing: Mandatory in all metastatic disease; positive (9-23%) qualifies for Trastuzumab
• MSI/MMR testing: MSI-high (~10%) may benefit from immunotherapy (pembrolizumab); do NOT give chemotherapy
• PD-L1: Immunotherapy targets

Staging (TNM / UICC 8th edition)

• T1: Mucosa/submucosa (T1a mucosa, T1b submucosa)
• T2: Muscularis propria
• T3: Subserosa
• T4: Through serosa (T4a), invades adjacent structures (T4b)
• N1-N3: 1-2, 3-6, 7+ regional nodes
• M0/M1: Absence/presence of distant metastasis

Management

• Early gastric cancer (T1a, ≤2 cm, well-differentiated): Endoscopic mucosal resection (EMR) or endoscopic submucosal dissection (ESD)
• Resectable gastric cancer (T1-T3, node positive): Neoadjuvant chemotherapy + surgery + adjuvant chemotherapy (FLOT protocol: 5-FU/leucovorin, oxaliplatin, docetaxel; or ECF/EOX/ECX)
• Surgery: Subtotal gastrectomy (distal tumors) or total gastrectomy (proximal/diffuse) + D2 lymph node dissection (gold standard - at least 15-16 nodes removed)
• Reconstruction after total gastrectomy: Roux-en-Y esophagojejunostomy

• Systemic chemotherapy: FLOT, or Trastuzumab + chemotherapy (HER2+), Pembrolizumab (MSI-high)
• Palliative gastrectomy (for bleeding/obstruction)
• Gastrojejunostomy or stenting (for pyloric obstruction)
• Radiotherapy (for pain from bone metastases)
• HIPEC (hyperthermic intraperitoneal chemotherapy) for selected low-burden peritoneal disease

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13. IHPS - Infantile Hypertrophic Pyloric Stenosis

Definition

Epidemiology

• Age of onset: 2-6 weeks of life (rarely before 2 weeks or after 3 months)
• Incidence: 1 in 300 live births
• M:F ratio = 4:1 (boys affected much more than girls)
• Firstborn male child most commonly affected
• Family history often present (especially maternal side)

Pathophysiology

• Hypertrophy AND hyperplasia of the pyloric circular muscle
• The pyloric "tunnel" elongates and narrows
• Gastric outlet obstruction → stomach dilates → forceful peristalsis
• Vomiting → loss of H+ and Cl- (gastric contents) → metabolic consequences

Clinical Features

• Onset: Starts around 2-6 weeks, worsens progressively
• Vomiting: Non-bilious (bile-free), projectile vomiting, occurring shortly after feeds - contents are only milk/food, never green
• Hungry infant: Baby is ravenous IMMEDIATELY after vomiting (key distinguishing feature from other causes)
• Visible gastric peristalsis: Seen passing left to right across epigastrium (wave of peristalsis)
• Palpable pyloric "tumor": Olive-shaped, firm mass in the right upper quadrant/epigastrium, felt during test feed when baby is relaxed

Metabolic Consequences

• Mechanism: Vomiting → loss of H+ and Cl- → metabolic alkalosis + hypochloremia → kidney compensates by excreting K+ and retaining H+ → hypokalemia + paradoxical aciduria
• Dehydration is also present

Investigations

1. Abdominal ultrasound: First-line - shows thickened (>3-4mm) and elongated (>14-16mm) pyloric muscle; the gold standard for confirmation
2. Test feed (clinical): Visible peristalsis + palpable olive = clinical diagnosis
3. Barium meal: Shows "string sign" (elongated, narrow pyloric channel) - rarely needed now
4. Bloods: U&E (hypokalemia, hypochloremia), ABG (metabolic alkalosis)

Management

• NBM, NG tube to decompress stomach
• IV fluids: 0.9% NaCl + 0.15% KCl in 5% dextrose
• Continue until Cl- > 100 mEq/L, K+ normal, pH normalized (takes 24-48 hours)

• Approach: Laparoscopic (preferred) or open (supraumbilical or right upper quadrant transverse incision)
• Procedure: A longitudinal incision is made through the pyloric serosa and muscle down to the intact submucosa - the muscle is spread apart (NOT sutured)
• The submucosa must remain intact; incomplete myotomy risks recurrence
• Post-op: Feeds started within 24 hours; early vomiting usually resolves quickly

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14. Sister Mary Joseph's Nodule

Definition

Eponym

Mechanism

• Spread occurs via:
  1. Lymphatics along the ligamentum teres (round ligament of the liver, remnant of umbilical vein) → carries tumor cells to umbilicus
  2. Peritoneal seeding (transcoelomic spread)
  3. Direct extension along embryological remnants

Primary Tumors (in order of frequency)

1. Gastric carcinoma (most common primary, ~20-35%)
2. Colorectal carcinoma
3. Ovarian carcinoma
4. Pancreatic carcinoma
5. Endometrial carcinoma
6. (Rarely) Unknown primary

Clinical Significance

• Sign of advanced (Stage IV) disease - indicates widespread metastatic spread
• Indicates peritoneal carcinomatosis in most cases
• Usually a poor prognostic sign
• Biopsy of the nodule can identify the primary tumor site using immunoperoxidase markers (IHC)

Differential Diagnosis of Umbilical Nodule

• Primary umbilical endometriosis (scar endometriosis)
• Umbilical hernia
• Keloid scar
• Urachal remnant
• Primary umbilical carcinoma (rare)

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15. Boubonocele (Bubonocele)

Definition

Classification of Inguinal Hernia by Extent

1. Bubonocele: Hernia remains within the inguinal canal (does not exit the superficial ring) - only a swelling in the groin
2. Incomplete inguinal hernia: Exits through the superficial ring but does NOT reach the bottom of the scrotum
3. Complete inguinal hernia: Exits the inguinal canal and reaches the bottom of the scrotum (scrotal hernia)

Types of Inguinal Hernia by Site of Exit

1. Indirect (Oblique) hernia (>80% of all inguinal hernias):
   • Exits through the deep (internal) inguinal ring - lateral to the inferior epigastric artery
   • Follows the inguinal canal obliquely
   • May be congenital (patent processus vaginalis) or acquired
   • Almost all hernias in women and children are indirect
   • Can become complete (scrotal)
2. Direct hernia:
   • Bulges through Hesselbach's triangle - bounded by lateral border of rectus abdominis (medially), inferior epigastric artery (laterally), and inguinal ligament (below)
   • Neck is medial to inferior epigastric artery
   • More common in older men (weakness of abdominal wall)
   • Rarely becomes complete

Types by Content

• Enterocele: Contains intestine
• Epiplocele/Omentocele: Contains omentum
• Cystocele: Contains urinary bladder

Bubonocele Exam Point

• In a bubonocele (indirect type), the hernia is NOT visible or palpable outside the inguinal canal
• May present as an inguinal lump without scrotal component
• Clinically: Mass in groin that is reducible and has a cough impulse
• Differentiated from incomplete/complete hernia by how far it descends

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Quick Summary Reference Table

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