What radiographic findings are generally associated with severe pulmonary venous hypertension? (PCWP = 25-30 mm Hg)

Alveolar edema, evidenced by ill-defined diffuse areas of increased density with a predilection for the perihilar area and lower lobes, and pleural effusions may be seen. Note that when the underlying condition is chronic, all of these changes tend not to occur until higher pressures are reached.