A detailed handwritten medical notes page on lined notebook paper with a slightly aged/cream background, written in blue and black ink in a neat medical student handwriting style. The notes are organized with underlined headings and subheadings, bullet points, arrows, and small diagrams. The content covers: TITLE (bold, underlined, centered): ACUTE APPENDICITIS SECTION 1 - ETIOPATHOGENESIS (underlined, blue ink): • Most common acute surgical emergency of the abdomen • Causes / Etiology: - Fecalith / appendicolith (50% of gangrenous cases) - Lymphoid hyperplasia (most common cause in young) - Undigested food residue, intraluminal scarring - Tumors, bacteria, viruses, IBD • Pathogenesis (with small arrow flow diagram): Luminal obstruction → Bacterial overgrowth → ↑ Intraluminal pressure → Lymphatic/venous obstruction → Vascular thrombosis → Ischemic necrosis → PERFORATION SECTION 2 - COMPLICATIONS (underlined, red ink): • Perforation (10-20% risk) • Pericecal / periappendiceal abscess • Generalized peritonitis (free perforation) • Pylephlebitis (suppurative thrombosis of portal vein) - RARE, poor prognosis • Bowel obstruction (from phlegmon / adhesions) • Sepsis / septic shock • Fistula formation • In elderly: mortality up to 32%! SECTION 3 - TREATMENT (underlined, green ink): 1. Resuscitation: IV fluids + broad-spectrum antibiotics 2. Uncomplicated Appendicitis: • Laparoscopic appendectomy (Gold Standard) • Nonoperative: antibiotics alone (72.7% success; ~25% recurrence at 1 yr) • Appendicolith → MUST operate (higher complication risk) 3. Complicated / Perforated: • Laparoscopic or open appendectomy • Percutaneous / IR drain for contained abscess • Interval appendectomy (6-8 wks) if mass/phlegmon 4. Antibiotic coverage: gram-negative and anaerobic organisms SECTION 4 - POSSIBLE OUTCOMES (underlined, purple ink): ✓ Simple appendicitis: mortality <1%, complication rate ~5.5% ✓ Hospital stay: 24-36 hrs (laparoscopic) / 24-48 hrs (open) ✓ Return to activity: 2 wks (lap) / 3 wks (open) ✗ Perforated: mortality 1-4%, complication rate 12-25% ✗ Elderly (>70 yrs): mortality up to 32% • Spontaneous resolution: possible in uncomplicated cases • Appendectomy protective against UC development Small sketch of cecum + appendix anatomy in bottom right corner with arrow pointing to McBurney's point. Paper has slight crinkle texture. Notes look authentic, handwritten, organized, and educational.