Confusable diagnoses · PANCE / PANRE

Community-Acquired Pneumonia vs Aspiration Pneumonia and Pneumonitis

Community-Acquired Pneumonia and Aspiration Pneumonia and Pneumonitis are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.

Community-Acquired Pneumonia vs Aspiration Pneumonia and Pneumonitis at a glance

  • Community-Acquired Pneumonia: Lower respiratory tract infection acquired outside of healthcare settings.
  • Aspiration Pneumonia and Pneumonitis: Lung injury from inhaled oropharyngeal or gastric contents — chemical vs infectious.
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Side-by-side comparison

FeatureCommunity-Acquired PneumoniaAspiration Pneumonia and Pneumonitis
At a glanceLower respiratory tract infection acquired outside of healthcare settings.Lung injury from inhaled oropharyngeal or gastric contents — chemical vs infectious.
Classic presentationLobar consolidation with bronchial breath sounds and egophony classically points to S. pneumoniae; bullous myringitis with patchy infiltrates suggests…Infiltrate in posterior segment of upper lobe or superior segment of lower lobe (supine aspiration); right side more common (more vertical right main…
Workup / key labsCBC (leukocytosis with left shift), BMP, lactate, procalcitonin (helps de-escalate antibiotics); Blood cultures × 2 if severe, ICU admission,…CBC, BMP, lactate, blood cultures (if pneumonia); Sputum Gram stain/culture; anaerobic culture rarely useful given oropharyngeal contamination; Swallow…
ImagingChest radiograph (PA and lateral) — REQUIRED to diagnose pneumonia; lobar consolidation, interstitial infiltrate, or cavitation; CT chest if non-resolving,…CXR — infiltrate in gravity-dependent segments; bilateral if large volume; CT chest if abscess, empyema, or non-resolution; identifies cavitation, foreign…
First-line treatmentOutpatient, no comorbidities, no recent antibiotics: amoxicillin 1 g TID OR doxycycline 100 mg BID OR macrolide (azithromycin, clarithromycin) if local…Aspiration pneumonitis (chemical, witnessed, no infection signs): supportive care — supplemental O2, suctioning, observation. Do NOT routinely give…

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Educational use only. This outline is a study aid for PA students and is not medical advice or a substitute for clinical judgment. FirstPassPA is an independent study tool and is not affiliated with, endorsed by, or sponsored by NCCPA. PANCE® and PANRE® are registered trademarks of the National Commission on Certification of Physician Assistants.