Human T-cell Lymphotropic Virus Type-1 (HTLV-1)-associated Bronchioloalveolar Disorder Presenting with Mosaic Perfusion

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Human T-cell lymphotropic virus type-1 (HTLV-1)-associated bronchioloalveolar disorder (HABA) is a specific state with chronic and progressive respiratory symptoms caused by bronchiolar or alveolar disorder characterized by smoldering adult T-cell leukemia or the HTLV-I carrier state. We herein report a rare case of HABA with an initial presentation of mosaic perfusion in the lung. The diagnosis was made according to the results of a flow cytometry analysis of the bronchoalveolar lavage fluid and pathological findings. Clinicians must be careful to recognize that mosaic perfusion may be a radiological finding of HABA.