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Fig. 7A —55-year-old man with paroxysmal nocturnal hemoglobinuria
(PNH) who presented with 6-week history of generalized edema and diffuse
abdominal pain. Sonographic study was performed showing that right and left
hepatic veins were obstructed. Term "spiderweb" was initially used
in description of angiographic findings in Budd-Chiari syndrome, and it means
presence of very small interwoven veins. This split image (gray scale on right
and color Doppler, shown here in gray scale, on left) shows example of
spiderweb circulation (arrowheads) with Budd-Chiari syndrome. Note
that nonconspicuity of these small-size veins made its visualization really
difficult on gray-scale sonography. On right, only intrahepatic portal vein
(arrow) is evident.
