Tuberc Respir Dis.  2011 Nov;71(5):359-362.

A Case of Pneumonia and Parapneumonic Effusion Caused by Streptococcus parasanguinis

• Park MR
• Park DI
• Yoo SJ
• Jung SY
• Eun HS
• Kim MJ
• Park JW
• Park HS
• Jung SS
• Kim JO
• Kim SY
• Lee JE

Abstract

Streptococcus parasanguinis is a Viridans group bacteria that is most often discovered in the oral cavity and causes dental plaque and endocarditis in a rat model. It has low virulence but an unknown relationship to human respiratory infections. We report on a 61-year-old woman who developed hemoptysis followed by pleuritic chest pain after conscious sedation during a gastroscopic polypectomy and was diagnosed with pneumonia and parapneumonic effusion from Streptococcus parasanguinis isolated in pleural fluid. Microaspiration during the procedure was presumed to play a role in the pathogenesis.

Keyword

Streptococcal Infections; Pneumonia; Pleural Effusion

MeSH Terms

Animals
Bacteria
Chest Pain
Conscious Sedation
Dental Plaque
Endocarditis
Female
Hemoptysis
Humans
Middle Aged
Mouth
Pleural Effusion
Pneumonia
Rats
Respiratory Tract Infections
Streptococcal Infections
Streptococcus

Figure

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  Figure 1 Chest PA view and chest CT. (A) Chest PA at a local clinic shows no active lung lesion. (B, C) Chest CT at a local clinic shows ill defined nodules in the posterior segment of the right upper lobe with patchy ground glass opacity in the posterobasal segment of the right lower lobe. (D) Chest PA on admission. Focal consolidation is seen in the right lower lung field. (E, F) Chest CT on admission shows increased extent of consolidation with ground glass opacity in the right lower lobe and a small volume of pleural effusion in a right-sided hemithorax. PA: posterior anterior; CT: computed tomography.

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  Figure 2 Chest PA view and chest CT. (A) Chest PA on day 9 of admission. Improved consolidation and an increased volume of pleural effusion is shown in the right lung. (B~D) Chest CT on day 9 of admission. Near complete clearing of the previous consolidation in the posterobasal segment of the right lower lung and increased volume of pleural effusion, which was considered a hemothorax, is shown. (E) Chest PA about 3 months after discharge. Decreased volume of pleural effusion is shown compared with that of day 9 from admission. (F~H) Chest CT about 3 months after discharge shows neither pleural effusion nor consolidation. PA: posterior anterior; CT: computed tomography.

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