It would be important to know if
the pneumonias have always occurred
in the same portion of lung; if so, that would suggest the existence of some type of congenital lung structure abnormality, with poor mucous drainage/clearance, that has predisposed him to recurrent infection. I suspect that his pediatrician has already checked for lung diseases such as CF, bronchomalacia, bronchopulmonary dysplasia, bronchiectasis and for inherited and acquired immunodeficiency states.