APPENDICITIS AND APPENDECTOMY JOHN
WASHINGTON 2026 COMPLETE CLINICAL
CASE QUESTIONS AND ANSWERS GRADED A+
FULL SOLUTION
◉ What embryologic structure does the appendix arise from?
Answer: Midgut derivative from the cecal diverticulum (SMA
territory).
◉ What is the most common position of the appendix? Answer:
Retrocecal (most common).
◉ What dermatome explains early periumbilical pain in
appendicitis? Answer: T10 dermatome (visceral afferent fibers).
◉ What landmark defines McBurney's point? Answer: One-third
distance from right ASIS to umbilicus.
◉ How do you find the appendix if not immediately visible? Answer:
Follow the three teniae coli on the cecum to their convergence.
◉ What structure forms the base of the appendix? Answer:
Posteromedial wall of the cecum just below the ileocecal valve.
, ◉ What venous system drains the appendix? Answer: Ileocolic vein
→ SMV → portal vein.
◉ What layers of bowel are transected at the appendiceal base?
Answer: Mucosa, submucosa, muscularis propria, and serosa.
◉ What distinguishes visceral from parietal pain? Answer: Visceral
is dull and poorly localized; parietal is sharp and well localized.
◉ Why divide the mesoappendix before addressing the base?
Answer: To control the appendiceal artery and mobilize the
appendix safely.
◉ Name three methods to control the appendiceal artery. Answer:
Energy device, clips, or vascular stapler.
◉ When is an endoloop preferred over a stapler? Answer: When the
base is small and not inflamed or friable.
◉ What must be confirmed before firing across the appendiceal
base? Answer: True base identified; no terminal ileum or cecum
trapped in the stapler.
WASHINGTON 2026 COMPLETE CLINICAL
CASE QUESTIONS AND ANSWERS GRADED A+
FULL SOLUTION
◉ What embryologic structure does the appendix arise from?
Answer: Midgut derivative from the cecal diverticulum (SMA
territory).
◉ What is the most common position of the appendix? Answer:
Retrocecal (most common).
◉ What dermatome explains early periumbilical pain in
appendicitis? Answer: T10 dermatome (visceral afferent fibers).
◉ What landmark defines McBurney's point? Answer: One-third
distance from right ASIS to umbilicus.
◉ How do you find the appendix if not immediately visible? Answer:
Follow the three teniae coli on the cecum to their convergence.
◉ What structure forms the base of the appendix? Answer:
Posteromedial wall of the cecum just below the ileocecal valve.
, ◉ What venous system drains the appendix? Answer: Ileocolic vein
→ SMV → portal vein.
◉ What layers of bowel are transected at the appendiceal base?
Answer: Mucosa, submucosa, muscularis propria, and serosa.
◉ What distinguishes visceral from parietal pain? Answer: Visceral
is dull and poorly localized; parietal is sharp and well localized.
◉ Why divide the mesoappendix before addressing the base?
Answer: To control the appendiceal artery and mobilize the
appendix safely.
◉ Name three methods to control the appendiceal artery. Answer:
Energy device, clips, or vascular stapler.
◉ When is an endoloop preferred over a stapler? Answer: When the
base is small and not inflamed or friable.
◉ What must be confirmed before firing across the appendiceal
base? Answer: True base identified; no terminal ileum or cecum
trapped in the stapler.
