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Figure 5 Histologic findings of the lung tissue in one patient with a prenatal diagnosis of hypoplastic left heart syndrome and a type C pulmonary vein (PV) flow pattern, who died at seven weeks of age. (a) There were dilated lymphatic vessels (L) and PVs with internal and external elastic lamellae, consistent with early stage arterialization. (Movat's stain, x100 magnification.) (b) Muscular pulmonary artery with medial (M) thickening and neointimal (N) hyperplasia, indicators of pulmonary hypertension, Heath-Edwards grade II, in the same infant. (Movat's stain, x400 magnification.)
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