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[A case of chronic aspiration pneumonia caused by juvenile brain stem tumor].

A 23-year-old man had been treated for repeated pneumonia from the age of 16. After a diagnosis of eosinophilic pneumonia at the age of 17, he had been given antibiotics and steroids. At the age of 23, he was referred to our hospital. Although he improved rapidly in response to antibiotic medication, his chest X-ray shadows did not improve. Video-assisted thoracoscopic lung biopsy was performed. Fibrosis and invasion of inflammatory cells were seen on the air duct walls and foreign bodies that were thought to be food residue were detected. A diagnosis of chronic aspiration pneumonia was made pathologically. A brain stem tumor was detected on his brain magnetic resonance imaging, which was thought to be the cause of his mis-swallowing.