Figure 2.

Transverse T1-weighted magnetic resonance images at the level of the left atrium in (a) a 4-day-old, 26-week gestation infant, and (b) a 2-day old, term infant. In the planes of the superimposed vertical white lines, signal intensity is graphed to the left of the images and shows that the preterm infant has a gravity-dependent increase in signal intensity as compared with the homogeneous pattern in the term infant. The arrow in panel a points to an area of dependent thickened pleural margin. With permission from Adams and coworkers [60].