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ALK-positive histiocytosis (APH) is a newly defined entity with specific histological features and a highly recurrent KIF5B-ALK gene fusion. APH is characterized by clonal proliferation of histiocytes and can present as either systemic or localized. It was first described in infants and then expanded to older children and adults. Although lung involvement has been shown in three systemic cases, localized lung lesions have not previously been reported. The ALK gene has many fusion partners in addition to KIF5B in APH. Here, we report a