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MODULE 17:
THE DIGESTIVE SYSTEM
PART 6 OF 7
Putting the chart together: recurrent abdominal attacks with fever and a normal appendix, plus newer malabsorptive symptoms and biopsy evidence of amyloid in the GI wall, in a patient with lifelong high IL-1b/IL-6 and SAA.
Slide 1 Transcript
PATIENT CHART
STINA
THIS PART
Age 45
PRESENTING WITH
Heartburn, bloating, weight loss
DIAGNOSIS
Recurrent Peritonitis and Gut Amyloidosis
CHART CLUES
COLLECTED AS YOU GO
Recurrent Sterile Attacks
Whole-Abdomen, Fever-Plus, Infection-Negative Attacks
Chronic Heartburn
Malabsorptive Symptoms
Persistently Elevated SAA and Rising Cholesterol
Biopsy-Proven Gut Amyloid
Recurrent Peritonitis and Gut Amyloidosis
Put your money down: Recurrent sterile attacks and biopsy-proven gut amyloid — one problem, or two?
Stina’s chart now holds two very different GI stories: a decade of sterile fever-and-pain attacks, and newer malabsorption with amyloid found in her gut wall. Before the videos, predict whether these are two separate diseases or two faces of a single one.
Pick the answer you believe now. We’ll come back to it later!
The Whole Chart, Together
Stina’s gut is being attacked in two completely different ways, on two different timescales. The first is loud and acute: peritonitis. FMF is a disease of serositis – inflammation of the serous membranesThin tissues that line body cavities and secrete fluid. – and the peritoneumThe membrane lining the abdominal cavity and organs. lining the abdomen is its most common target. When IL-1b-driven inflammation flares, the peritoneum becomes acutely inflamed without any infection, producing exactly Stina’s picture: sudden severe abdominal pain, rigidity, tenderness, and fever, lasting a day or two and then resolving. Because sterile peritonitis mimics a surgical abdomen so faithfully, it is classically mistaken for appendicitis – which is why a nineteen-year-old with FMF can lose a perfectly normal appendixA small, finger-like pouch attached to the cecum, thought to play a role in immune function.. This is the same serositis that, elsewhere in the case, inflames her pericardiumThe membrane surrounding the heart. and her pleuraThe double-layered membrane surrounding the lungs and lining the thoracic cavity.; the abdomen is simply where it strikes most often.
The Peritoneum Can Burn
A serous membrane is a membrane that can inflame.
Slide 2 Transcript
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Single Choice: Which statement about the Peritoneum Can Burn is correct?
Serositis, Not Infection
Fire without a fire-starter.
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Drag the Words: Match each term to its role in serositis, Not Infection.
A Membrane Ablaze
The second attack is silent and chronic: amyloid. The SAA her liverA large organ that produces bile, detoxifies blood, and stores nutrients. has been overproducing for decades deposits, fragment by fragment, as AA amyloid fibrils in the wall of the GI tract – often beginning in the small intestine and its immune-rich Peyer’s patches. Unlike the dramatic attacks, this process announces itself quietly, as malabsorption: loose stools, bloating, and the slow weight loss now appearing in her chart. The gut is, in factA statement based on direct observation that is repeatedly confirmed., one of the first places AA amyloid tends to land, which makes Stina’s newer symptomsSubjective experiences reported by the patient (e.g., nausea, fatigue). an early warning, not a footnote. Read together, the loud attacks and the quiet deposits are two faces of one disease: chronic IL-1b/IL-6 inflammation inflaming the serosa from outside and seeding amyloid within. Neither is irritable bowel, a stomach bug, or stress.
The Serositis Family
One membrane design, three body cavities.
Slide 2 Transcript
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Fill in the Blanks: Complete the key terms for the Serositis Family.
Silent Amyloid
A protein that quietly turns to stone.
Slide 2 Transcript
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Mark the Words: Mark the words that describe silent Amyloid.
A Wall Turning to Stone
For Stina, the two threats finally show themselves as one. The serosal fire is sterile peritonitis — the peritoneum, a serous membrane much like the pericardium, inflaming across the whole belly to produce her fever-and-pain attacks. The silent deposits are amyloid — misfolded from the liver’s chronically elevated SAA — infiltrating her gut wall and producing her malabsorption. They look unrelated, one loud and episodic, one quiet and chronic, but both flow from the same chronic inflammation: one inflames the membrane, the other petrifies the wall. And because the peritoneum’s serous kin include the pleura and pericardium, this fire is not confined to her belly.
Amyloid in the Gut Wall
Where the silent deposits show up.
Slide 2 Transcript
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Where the silent deposits show up.
Two Threats, One Fire
Loud attacks and quiet deposits, one source.
Slide 2 Transcript
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Sort the Paragraphs: Put the steps of two Threats, One Fire in the right order.
A Membrane Ablaze, a Wall Turning to Stone
The belly’s two problems, one cause.
Slide 2 Transcript
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Dialog Cards: Flip the cards to review A Membrane Ablaze, a Wall Turning to Stone.
FINDING!
Recurrent Peritonitis Plus Biopsy-Proven Gut Amyloid
The synthesis sign: recurrent sterile peritonitis (fever-and-pain attacks with a normal appendix and no infection) together with biopsy-proven amyloid in the GI wall causing malabsorption. Both arise from one chronic inflammatory driver — sterile inflammation of the peritoneal serous membrane, and depositionThe process of bone matrix formation by osteoblasts. of amyloid (misfolded from the liver’s SAA) in the gut wall.
Confirm or refute your bet: Recurrent sterile attacks and biopsy-proven gut amyloid — one problem, or two?
The serosal fire — sterile peritonitis of a serous membrane much like the pericardium — drives Stina’s loud attacks, while silent amyloid, deposited from her liver’s overproduced SAA, infiltrates her gut wall and drives her quiet malabsorption. Both flow from the same chronic inflammation. The peritoneum’s serous kin — the pleura, the pericardium — mean the same fire could strike beyond the belly.
Slide 8 Transcript
NEXT PART
Six pages in, the attacks have a mechanism and the quiet symptoms have a cause. The last page lays them beside Stina’s labs and the surgeon’s pathology report – and names what they spell.
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← Familial Mediterranean Fever — case home
All pages for Module 17 — The Digestive System
17.0 Module Overview
17.1 The Attack That Looked Like Appendicitis
17.2 One Long Tube, Four Layers
17.3 Mouth to Stomach: Starting the Breakdown
17.4 The Intestines: Absorption and the Gut’s Immune Watch
17.5 The Liver, Gallbladder, Pancreas & the Hepatic Portal System
17.6 The Serosal Fire and the Silent Deposits
17.7 Amyloid in FMF
17.8 Conclusion and Assessment
17.9 Evidence Behind the Case
All Modules
- Anatomical Language, Membranes & Homeostasis
- Just Enough Chemistry
- The Cell & Its Transport
- Making Cells & Proteins
- The Integumentary System
- The Skeletal System
- The Muscular System
- Nervous Tissue & the Senses
- The Spinal Cord
- The Brain & the Blood–Brain Barrier
- The Autonomic Nervous System
- Special Senses (in developmentThe process of growth and differentiation.)
- The Endocrine System
- Blood
- The Heart
- Blood Vessels
- The Digestive System
- The Respiratory System
- The Urinary System
- Fluids, Electrolytes & Acid–Base Balance
- The Reproductive System
- The Immune System
List of terms
- serous membranes
- peritoneum
- appendix
- pericardium
- pleura
- liver
- fact
- symptoms
- deposition
- development