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For a 28-year-old previously healthy man with ~2 weeks of progressive fever, profound malaise, and multiorgan involvement, you want to prioritize serious systemic conditions—especially infectious and inflammatory causes.
Top 3 Differential Diagnoses (DDx)
1. Subacute Infective Endocarditis
Classic for subacute, progressive illness over weeks
Symptoms: fever, fatigue, malaise, possible multiorgan effects (emboli → kidneys, brain, skin)
Risk factors may be subtle (e.g., minor valve abnormality, dental work, skin breaches from mechanic work)
Key clues to look for:
New murmur
Splinter hemorrhages, Osler nodes, Janeway lesions
Hematuria or renal dysfunction
2. Disseminated Tuberculosis (Miliary TB)
Can present insidiously with fever + systemic decline
Multiorgan involvement (lungs, liver, bone marrow, CNS)
Even immunocompetent patients can develop it
Key clues:
Night sweats, weight loss
Abnormal chest imaging (diffuse micronodules)
Hepatosplenomegaly
3. Hemophagocytic Lymphohistiocytosis (HLH) (or severe systemic inflammatory syndrome)
Hyperinflammatory condition—can be triggered by infection (e.g., EBV), malignancy, or autoimmune disease
Presents with fever + multiorgan dysfunction
Rapidly progressive and life-threatening
Key clues:
Cytopenias
Very high ferritin
Liver dysfunction, splenomegaly
Strong Contenders / Must Not Miss
Depending on further details, also consider:
Acute HIV seroconversion
Lymphoma (especially aggressive types)
Systemic autoimmune disease (e.g., lupus)
Sepsis from occult source
Next Steps (Key Workup)
Blood cultures ×3 (before antibiotics)
CBC, LFTs, ferritin
HIV test
Chest X-ray / CT
Echocardiogram (TEE if suspicion high)
TB testing (IGRA, sputum if indicated)
If you want, I can walk through how to narrow this down step-by-step like in a clinical exam vignette—just share the next part of the case.
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