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Type Ir pleuropulmonary blastoma in a 3‐year‐old child with asthma

To the Editor, Pleuropulmonary blastoma (PPB) is a type of primary lung malignancy in childhood and is thought to arise from primitive interstitial mesenchyme of the lung. Because PPB is often associated with congenital pulmonary airway malformation (CPAM) type 4, there is debate as to whether they are separate or singular entities. Given its relative rarity, PPB is not often present on initial differential diagnosis lists. This case of PPB highlights why physicians must keep broad differentials and be flexible in their thinking.