The most common findings on HRCT are diffuse hyperdense ground-glass attenuation and subpleural linear calcifications, often most predominant in the inferior and posterior portions of the lungs.[15][18][19][20][21][22] Additionally, the medial aspects of the lungs appear to be more heavily involved than the lateral aspects.[20] Ground-glass opacities, probably due to small calculi in the air space, are the most common finding in children and in patients with early-stage PAM.[19]