Infiltrates in upper lobes mean infection and Tubercular infection
needs to be ruled out as TB commonly affects the upper lobes. Since your husband`s next x ray negates these findings, the diagnosis of TB is not confirmed. Does he have any symptoms like low grade fever
, cough or weight loss
. You may get a CT chest done or consult a pulmonologist
who may examine him clinically after taking a detail history and advise if any more tests are required.