Figure 1.

Chest CT scan before treatment (A, axial plane) showing ground-glass opacities in the right upper lobe and septal lines associated with thickening of bronchovascular bundles in the right lower lobe (B). The latter are nicely depicted on T2-weighted thoracic MRI images (arrowhead) (F). Multiple splenic and a few vertebral nodules were hypertense on T2-weighted images (arrows). A large mediastinal lymphangioma mimicks a pericardial effusion (E). Chest CT scan performed 6 months after treatment with sildenafil was started shows complete regression of ground-glass opacities in the right upper lobe (C), with unchanged septal lines in the lower lobe (D).