The upper segment of the RLL is very large and is composed of cysts of different sizes, ranging up to a diameter of 2.5 cm. The entire lesion measures 4.8 x 4.1 x 4.7 cm. Mild adjacent pleural thickening. No soft tissue component or abnormal vasculature. Small RUL atelectasis. Small atelectases in the dependent portions. Mild tracheal compression anteriorly by the brachiocephalic artery.
In summary: features consistent with CPAM.