FIG 6. Preterm infant of 28 weeks' gestation (case 2) at age 4 weeks.

A, T1-weighted (600/20) SE sequence shows abnormal high signal intensity within the posterior putamen (arrowhead), globus pallidus (long arrow) on the right, and lateral thalamus (short arrow). The posterior limb of the internal capsule is of uniform low signal intensity. There is an artifact of uncertain origin over the right insula cortex.

B, High-power histologic section of damaged deep gray matter shows that the posterior limb of the internal capsule is edematous (arrowhead). The adjacent globus pallidus is darkly stained owing to capillary proliferation and mineralization of dead neurons (short arrow). The posterior part of the putamen is pale as a result of extensive tissue loss (long arrow) (hematoxylin-eosin, original magnification x 22.5).