For each of the following clinical vignettes featuring chronic gastrointestinal symptoms, select the most appropriate underlying etiology from the diagnostic options.
- A 45-year-old with type 1 diabetes describes frequent, voluminous watery bowel movements including nocturnal awakenings. Endoscopic evaluation is grossly unremarkable, but histology demonstrates increased intraepithelial lymphocytes without crypt distortion.Microscopic colitis
- A 52-year-old reports greasy, foul-smelling stools, diffuse bone pain, and right flank pain. History is notable for recurrent calcium oxalate nephrolithiasis, fistulizing perianal disease, and right lower quadrant tenderness.Crohn disease
- A 60-year-old presents with a year of episodic diarrhea, worsening memory, and migratory joint pain. Examination reveals generalized lymphadenopathy and a newly detected early diastolic decrescendo murmur.Whipple disease
- A 38-year-old complains of explosive, non-bloody watery diarrhea occurring primarily after meals. Her symptoms began insidiously several months following an uncomplicated laparoscopic cholecystectomy for symptomatic cholelithiasis.Bile acid malabsorption
Answer
Vignette 1 matches Microscopic colitis; Vignette 2 matches Crohn disease; Vignette 3 matches Whipple disease; Vignette 4 matches Bile acid malabsorption.
Formulating an accurate differential diagnosis for chronic diarrhea requires recognizing pattern clusters. Microscopic colitis presents with watery diarrhea and normal endoscopy in autoimmune patients. Crohn disease involves the terminal ileum, causing fat malabsorption and secondary oxalate stones. Whipple disease is a multisystem bacterial infection affecting the gut, joints, heart, and central nervous system. Bile acid malabsorption frequently occurs as a secretory diarrhea following cholecystectomy due to altered enterohepatic circulation.
Step-by-Step Solution
Key Concept
Differentiating etiologies of chronic diarrhea requires synthesizing gastrointestinal symptoms with specific extraintestinal manifestations, historical surgical risk factors, and histologic findings.