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Appendix Disorders - Complete Surgical Reference Tables

Sources: Sabiston Textbook of Surgery (11e), Bailey & Love's Surgery (28e), Schwartz's Principles of Surgery (11e), Mulholland & Greenfield's Surgery (7e), Fischer's Mastery of Surgery (8e), Current Surgical Therapy (14e)

Table 1: Anatomy & Physiology of the Appendix

Feature	Detail
Structure	Finger-like, antimesenteric projection of the cecum
Length	Up to ~9 cm
Diameter (normal)	~6 mm
Wall layers	Mucosa, submucosa, muscularis externa, serosa
Mucosa type	Colonic (columnar epithelium + goblet cells + neuroendocrine cells)
Blood supply	Appendiceal artery (branch of ileocolic artery), runs in mesoappendix
Innervation	Autonomic only - NO somatic pain fibers
Lymphoid tissue	Abundant lymphoid follicles in submucosa
Attachment	At cecum, at proximal convergence of taeniae coli
Function	Repository for beneficial gut microbiome bacteria; immune defense

Appendix Positions (Wakeley, 10,000 postmortem cases):

Position	Frequency
Retrocecal	65.3%
Pelvic	31%
Subcecal	2.3%
Preileal (anterior)	1%
Right paracolic / postileal	0.4%

Table 2: Acute Appendicitis - Overview

Feature	Details
Incidence	Most common urgent general surgical operation in the USA; ~300,000 hospitalizations/year
Lifetime risk	6-7% of general population
Peak incidence	2nd decade of life
Sex	Slightly higher in males
Geography	Less common in underdeveloped countries (diet: low-fiber, high-fat implicated)

Table 3: Pathophysiology of Acute Appendicitis

Step	Mechanism
1. Obstruction	Fecolith, lymphoid hyperplasia, mucus plug, tumor, or parasites block appendiceal orifice
2. Closed-loop obstruction	Continued mucus secretion raises intraluminal pressure
3. Bacterial overgrowth	Normal gut flora proliferate - E. coli, Bacteroides, etc.
4. Ischemia	Increased pressure exceeds venous pressure - mucosal ischemia
5. Inflammation	Transmural inflammation - visceral pain (periumbilical)
6. Peritoneal irritation	Serosal involvement - somatic pain shifts to RLQ
7. Perforation	If untreated - gangrenous/perforated appendicitis

Table 4: Bacteriology of Appendicitis (Gram-negative dominant)

Organism	Frequency
Escherichia coli	64.6%
Pseudomonas aeruginosa	16.4%
Klebsiella pneumoniae	5.3%
Enterococcus spp.	3.9%
Streptococcus spp.	2.9%
Citrobacter spp.	2.6%
Enterobacter spp.	1.4%
Staphylococcus spp.	0.7%

Source: Sabiston Textbook of Surgery, adapted from Song et al., Int J Colorectal Dis 2018

Table 5: Clinical Presentation of Appendicitis

Feature	Classic Presentation
Initial pain	Periumbilical/central (visceral, dull) - due to autonomic innervation
Pain migration	Moves to RLQ (McBurney's point) as peritoneum becomes involved
Anorexia	Almost always present
Nausea/vomiting	Common, usually after pain onset
Bowel habit	Either constipation OR diarrhea
Fever	Low-grade (<38.5°C) to high; absence does NOT exclude appendicitis
Position	Patient lies still (movement worsens peritoneal pain)
Atypical (retrocecal)	Flank or back pain, more subacute
Atypical (pelvic tip)	Suprapubic pain, may mimic UTI

Table 6: Physical Signs of Appendicitis

Sign	Description	Position of Appendix
McBurney's point tenderness	Tenderness at 1/3 from ASIS to umbilicus	Standard RLQ
Rebound tenderness (Blumberg)	Pain on sudden release of pressure	Any
Guarding/rigidity	Involuntary muscle spasm, RLQ	Any
Rovsing's sign	Pressure in LLQ causes pain in RLQ	Any
Psoas sign	Pain with right hip extension (passive)	Retrocecal
Obturator sign	Pain with internal rotation of flexed right hip	Pelvic
Dunphy's sign	Increased pain with coughing	Peritonitis present
Rectal/cervical tenderness	Pain on rectal or cervical exam	Pelvic appendix

Table 7: Alvarado Score (MANTRELS) for Appendicitis

Criterion	Score
Migration of pain to RLQ	1
Anorexia	1
Nausea/Vomiting	1
RLQ tenderness	2
Rebound tenderness	1
Elevated temperature (>37.3°C)	1
Leukocytosis (WBC >10,000)	2
Shift to left (neutrophilia)	1
Total	10

Score	Interpretation
1-4	Unlikely appendicitis
5-6	Possible - observe/investigate
7-8	Probable - surgery likely
9-10	Very likely - operate

Table 8: Investigations in Appendicitis

Investigation	Findings in Appendicitis	Notes
WBC	Elevated (>10,000); left shift	Present in most but not diagnostic alone
CRP	Elevated, rises with progression	More specific for perforation if very high
Urinalysis	Usually normal; mild pyuria/hematuria if pelvic	Significant pyuria suggests UTI/urolithiasis
Beta-hCG	Must exclude pregnancy (females)	Ectopic pregnancy is key differential
Ultrasound (US)	Non-compressible appendix >6 mm; wall >2 mm; pain on compression	Sensitivity limited; operator-dependent; first-line in children/pregnancy
CT Abdomen (gold standard)	Appendicolith, fat stranding, diameter >10-13 mm, wall thickening >3 mm, phlegmon	Best sensitivity & specificity; low-dose equivalent to standard-dose
MRI	High sensitivity & specificity	Used in pregnancy to avoid radiation
Plain X-ray	Faecolith (rare), loss of psoas shadow	Low utility; mostly obsolete

Table 9: Classification of Appendicitis

Type	Features	Management
Acute Uncomplicated	Inflamed, intact appendix; no perforation	Appendectomy OR antibiotics (selected cases)
Acute Complicated	Gangrene, abscess, phlegmon, perforation	Appendectomy (urgent or interval)
Perforated	Free perforation; periappendiceal gas on CT	Urgent appendectomy + washout
Appendiceal Abscess/Phlegmon	Contained infection, inflammatory mass	Antibiotics + drainage; interval appendectomy in 6-12 weeks
Recurrent/Chronic	Recurrent episodes of RLQ pain; prior incomplete resolution	Elective appendectomy
Stump Appendicitis	Inflammation of appendiceal remnant after prior appendectomy	Surgical re-excision

Table 10: Management of Acute Uncomplicated Appendicitis

Approach	Details	Outcome
Appendectomy (standard)	Laparoscopic (preferred) or open; performed urgently	Definitive; ~3% negative appendectomy rate
Antibiotics first (non-operative)	IV broad-spectrum antibiotics; reserved for no fecolith, good follow-up	~73% success at 1 year; 27% fail and need appendectomy
Antibiotics used	IV piperacillin-tazobactam or cefoxitin + metronidazole; transition to oral	Based on cultures (E. coli dominant)

Table 11: Management of Complicated Appendicitis

Scenario	Option 1	Option 2	Option 3
With abscess/phlegmon	Urgent appendectomy	Antibiotics + percutaneous drainage, then interval appendectomy (6-12 weeks)	Antibiotics + drainage, then NO appendectomy (observe with CT/colonoscopy)
With perforation/free peritonitis	Urgent appendectomy + peritoneal washout	-	-
Interval appendectomy rationale	Reduced adjacent structure injury; less inflammation	-	-

Table 12: Laparoscopic vs Open Appendectomy

Parameter	Laparoscopic	Open
Complications	Lower overall	Higher wound complications
Wound infection	Lower	Higher
Postoperative pain	Less	More
Recovery time	Shorter	Longer
Intraabdominal abscess	Slightly higher in some studies	Lower
Peritoneal inspection	Excellent (whole abdomen)	Limited
Cost	Marginally higher	Lower
Preferred approach	Yes - including elderly, pregnant, complicated	Acceptable if laparoscopy unavailable
Incision (open)	McArthur-McBurney (oblique) or Rockey-Davis (transverse)	-

Table 13: Appendicitis in Special Populations

Population	Key Differences	Management
Pregnancy	Most common non-obstetric emergency in pregnancy; typical presentation only 50-60% of cases; nausea/vomiting nonspecific; appendix displaced cephalad by gravid uterus; labs unreliable	MRI preferred imaging; appendectomy (laparoscopic acceptable); negative appendectomy carries fetal loss risk - operate early
Elderly	Vague symptoms; presentation often delayed; higher perforation rate	Lower threshold for CT; prompt surgery; higher morbidity
Immunocompromised	Atypical presentation; higher risk of complications	Lower threshold to operate; IV antibiotics early
Children	Higher perforation rate (thinner omentum); US first-line; delayed presentation common	CT if US non-diagnostic; laparoscopic appendectomy

Table 14: Differential Diagnosis of Appendicitis

Condition	Distinguishing Features
Mesenteric adenitis	Children; viral URTI; no guarding
Ectopic pregnancy	Positive beta-hCG; vaginal bleeding
Ovarian torsion	Sudden onset; US shows ovarian pathology
Tubo-ovarian abscess	Pelvic tenderness; fever; vaginal discharge
Meckel's diverticulitis	Younger patients; often indistinguishable preoperatively
Crohn's disease (terminal ileum)	History; thickened terminal ileum on CT
Pyelonephritis / Urolithiasis	CVA tenderness; significant pyuria; flank pain
Cecal carcinoma	Older patients; mass on CT
Cecal diverticulitis	CT distinguishes; older patients
Yersinia ileitis	Culture; similar imaging to Crohn's
Psoas abscess	Psoas sign; CT shows abscess
Sigmoid diverticulitis	Usually LLQ; older patients

Table 15: Neoplasms of the Appendix

Tumor Type	Key Features	Treatment
Carcinoid / NET (most common)	Usually at tip; often <2 cm; low malignant potential; may produce 5-HIAA	<2 cm: appendectomy only; >2 cm: right hemicolectomy
Mucinous neoplasm (LAMN/HAMN)	Mucin-producing; may cause pseudomyxoma peritonei (PMP)	Appendectomy; if perforation/PMP: HIPEC + cytoreduction
Adenocarcinoma	Rare; aggressive; often presents as appendicitis	Right hemicolectomy
Goblet cell carcinoma (GCC)	Mixed carcinoid-adenocarcinoma features; more aggressive	Right hemicolectomy
Pseudomyxoma Peritonei (PMP)	Mucin implants throughout peritoneum; from perforated mucinous neoplasm	Cytoreductive surgery (CRS) + hyperthermic intraperitoneal chemotherapy (HIPEC)

Appendiceal NET - Tumor Size Treatment Guide:

Size	Lymph Node Risk	Surgery
<1 cm	<2%	Appendectomy alone
1-2 cm	1-2%	Appendectomy; consider right hemicolectomy
>2 cm	Up to 30%	Right hemicolectomy mandatory

Table 16: Other Appendix Disorders

Disorder	Description	Treatment
Appendiceal Diverticulitis	Diverticula of appendix become inflamed; rare; mimics acute appendicitis	Appendectomy
Crohn's Disease of Appendix	Isolated Crohn's appendicitis; very rare; part of ileal/colonic Crohn's	Medical (Crohn's therapy); appendectomy if isolated
Mucocele	Dilated mucin-filled appendix; can be benign (retention cyst) or neoplastic (LAMN)	Appendectomy (avoid rupture); assess for neoplasm
Intussusception	Appendix intussuscepts into cecum; rare	Appendectomy
Appendiceal Abscess	Contained pericaecal collection; sequel of perforated appendicitis	Drainage (percutaneous or surgical) + antibiotics; interval appendectomy
Appendiceal Stump Appendicitis	Recurrent appendicitis in residual stump after appendectomy	Re-appendectomy/stump excision
Appendiceal Endometriosis	Endometrial tissue in appendiceal wall; cyclical RLQ pain	Appendectomy
Appendiceal Torsion	Appendix twists on its mesoappendix; rare	Appendectomy

Table 17: Surgical Scoring & Decision Pathway

Step	Action
1	Clinical assessment + Alvarado score
2	Labs: CBC, CRP, beta-hCG (females), U/A
3	Imaging: US first (children/pregnant); CT for adults
4	Score 7-10 / typical CT: proceed to appendectomy
5	Score 5-6 / equivocal: observe 6-12 hours, repeat assessment
6	Complicated (abscess/phlegmon): antibiotics ± drainage; plan interval vs no appendectomy
7	Perforated: urgent appendectomy + washout
8	Incidental normal appendix at operation: incidental appendectomy debatable - generally performed if abdomen already open

Table 18: Antibiotic Regimens in Appendicitis

Scenario	Preferred Regimen
Preoperative prophylaxis	Single dose cefoxitin or cefazolin + metronidazole
Uncomplicated (non-operative)	Ertapenem IV or amoxicillin-clavulanate; transition to oral augmentin
Complicated (gangrenous/perforated)	Piperacillin-tazobactam IV or ceftriaxone + metronidazole; 3-5 days post-op
Appendiceal abscess (conservative)	Broad-spectrum IV antibiotics 5-7 days, then oral step-down

Key Sources:

Sabiston Textbook of Surgery, 21e - Chapter 94 (Appendix)
Mulholland & Greenfield's Surgery, 7e - Chapter 71 (Appendiceal Diseases)
Schwartz's Principles of Surgery, 11e - Appendiceal Neoplasms
Bailey & Love's Short Practice of Surgery, 28e - Appendiceal Carcinoid
Fischer's Mastery of Surgery, 8e - Appendiceal Diverticulitis
Current Surgical Therapy, 14e - Appendicitis & Appendiceal Neoplasms

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