There are three principal varieties of pulmonary edema: cardiac, overhydration and increased capillary permeability (ARDS). 
The vascular pedicle width (VPW) can help in differentiating these different forms of pulmonary edema (6):
 - Normal VPW: most common in capillary permeability or acute cardiac failure.
 - Widened VPW: most common in overhydration/renal failure and chronic cardiac failure.
 - Narrowed VPW: most common in capillary permeability. #Clinical #Radiology #CXR #CHF #Vascular #Pedicle #Width #Comparison #VascularPedicleWidth #RadiologyAssistant