A 3.5 MHz curvilinear transducer was placed in an oblique intercostal orientation, with the probe marker maintained cephalad. A loss of lung sliding pattern and A-lines were demonstrated, replaced by a hypoechoic collection with irregular contours. Arborizing, hyperechoic linear structures dispersed throughout the lesion, demonstrating movement in tandem with respiration. Punctate echogenic foci were scattered throughout the lesion, which were unaffected by respiration.
Diagnosis: in the context of a febrile child presenting with respiratory complaints, a lower respiratory tract infection is highly likely. Features are consistent with pneumonia, as described by the International Consensus Conference on Lung Ultrasound 1.