Fig. 2. Cystic Adenomatoid Malformation (CCAM) of the fetal lung. The condition is usually described as either type I (a), II (b) or III (c, d) based on the presence and size of visible cystic areas on the ultrasound image. (d) Dotted line delineates the type III lesion; remnant lung is squeezed between lesion, heart and thorax on transverse and longitudinal section. (e) MR image of cystic lesion. (f) Shunted cystic lesion, with tip of pigtail visible on ultrasound both sides of the thorax wall and at birth (g).