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Updated: Oct 29, 2025
Experimental Model to Evaluate Resolution of Pneumonia
Published on: February 17, 2023
A rare case of diffuse alveolar hemorrhage caused by acute mycoplasma pneumoniae pneumonia
Sarah Schmitz1, Matan Arnon1, Christina Martin2
1Department of Medicine, Temple University Hospital, Philadelphia, PA, USA.
Abstract:
Mycoplasma pneumoniae is a common bacterial pathogen that causes atypical community-acquired pneumonia. Illness onset can be gradual and progressive over weeks. Patients typically have cough, pharyngitis, malaise, and tracheobronchitis. Although symptoms are frequently mild, the initial presentation can be severe with numerous complications. We present a case of a 28-year-old male who presented with 1 day of significant hemoptysis. He was intubated for airway protection and underwent bronchoscopy, which showed multiple blood clots in several lung lobes, consistent with diffuse alveolar hemorrhage (DAH). His workup was negative for pulmonary embolism, coagulopathy, and vasculitis. He tested positive for rhinovirus and mycoplasma pneumoniae IgM (negative IgG). He was ultimately discharged home with oral doxycycline to complete a 10-day course. DAH is a rare presentation and life-threatening complication of mycoplasma pneumonia. Although there is a reported association between DAH and rhinovirus, our patient improved with antibiotics making mycoplasma pneumoniae the likely culprit. When encountering hemoptysis or alveolar bleeding, clinicians should have low suspicion for atypical infections and start appropriate antibiotics early in the clinical course.
Insights
Mycoplasma pneumoniae can cause diffuse alveolar hemorrhage (DAH), a rare and severe complication. Early antibiotic treatment for atypical infections is crucial for patients presenting with hemoptysis.
Area of Science:
- Pulmonology
- Infectious Diseases
- Critical Care Medicine
Background:
- Mycoplasma pneumoniae is a common cause of atypical pneumonia.
- Pneumonia symptoms are typically mild but can present severely with complications.
- Diffuse alveolar hemorrhage (DAH) is a rare but life-threatening complication.
Purpose of the Study:
- To report a rare case of DAH secondary to Mycoplasma pneumoniae infection.
- To highlight the importance of considering atypical infections in patients with hemoptysis.
- To emphasize early antibiotic intervention for suspected atypical pneumonia.
Main Methods:
- Case presentation of a 28-year-old male with hemoptysis.
- Diagnostic workup including bronchoscopy, embolism, coagulopathy, and vasculitis screening.
- Infectious agent identification via serological testing (IgM/IgG).
Main Results:
- The patient presented with significant hemoptysis, leading to intubation and bronchoscopy.
- Bronchoscopy revealed diffuse alveolar hemorrhage (DAH).
- Mycoplasma pneumoniae IgM was positive; rhinovirus was also detected. The patient improved with doxycycline, implicating Mycoplasma pneumoniae.
Conclusions:
- Diffuse alveolar hemorrhage (DAH) is a rare, severe complication of Mycoplasma pneumoniae.
- Clinicians should maintain a low threshold for suspecting atypical infections in cases of hemoptysis.
- Early initiation of appropriate antibiotics is recommended for suspected atypical pneumonia presenting with alveolar bleeding.
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