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A 90-year-old man with a previous history of brain infarction and diabetes mellitus presented with a gait disturbance. Although brain computed tomography (CT) showed no abnormalities, except for the old infarction, the patient experienced recurrent epileptic seizures. He was therefore admitted to our hospital for a further examination of the seizures. However, upon admission, he also presented with a fever and elevated C-reactive protein levels, indicating systemic inflammation. Based on the presence of bilateral infiltration visible on a chest X-radiograph, the patient was diagnosed with aspiration pneumonia. The administration of 4.5 g of sulbactam and ampicillin did not reduce the inflammation or resolve the abnormal lung findings. Therefore, he was intubated and placed on a ventilator. With the patient under ventilator management, we subsequently performed bronchoscopic alveolar lavage. Elevated neutrophil and lymphocyte counts were noted in the alveolar lavage fluid; therefore, we administered pulse steroid therapy with 500 mg of methylprednisolone. The sputum and alveolar lavage fluid samples collected 13 and 14 days, respectively, after admission were negative for Mycobacterium according to a smear test. In contrast, the cultured sputum samples collected on day 13 were positive for Mycobacterium tuberculosis; polymerase chain reaction testing confirmed the sputum culture results. A postmortem pathological examination of the lungs revealed neutrophilic exudative pneumonia as well as acute fibrinous and organizing pneumonia. Although Ziehl-Neelsen staining demonstrated a large number of positive bacteria, no epithelioid-cell granulomas were observed. M. tuberculosis lesions were also found in the liver, spleen, bones, and adrenal glands, suggesting hematogenous dissemination. Aspiration pneumonia is very common in elderly patients with a history of stroke, and these patients are also at risk of other pulmonary disorders and infections including M. tuberculosis. Prior to administering treatment for aspiration pneumonia, clinicians should consider the potential for other pulmonary infiltration disorders in the differential diagnosis, particularly in elderly post-stroke patients.

Development of exudative tuberculosis during treatment for aspiration pneumonia in an elderly post-stroke patient with symptomatic epilepsy