<num>. et and ng tubes, as described. <num>. iabp radiopaque tip probably lies at or immediately below the inferior edge of the aortic knob. <num>. dense left-greater-than-right opacities, with upper lobe predominance and sparing of the bases. while this could represent an atypical distribution of chf, including changes associated with valve dysfunction, in the appropriate clinical setting, the upper lobe predominance would also raise the question of infectious or inflammatory etiologies.