Analysis of signs of digital subtraction angiography of small intestinal stromal tumor

Objective To summarize the features of signs of digital subtraction angiography (DSA) of small intestinal stromal tumor (SIST) with different invasion risk degrees.
Methods The clinical data of 15 patients with SIST who were admitted to the West China Hospital of Sichuan University from September 2008 to June 2010 were retrospectively analyzed. The signs of DSA of SIST with different invasion risk degrees were analyzed.
Results The result of DSA showed that 1 patient with lowinvasive SIST presented draining veins and clear edge with homogeneously stained tumor in arterial phase. Enlarged tumors vessels, sharp edges and uniform tumor staining were observed in 4 patients with lowinvasive risks. Enlarged and disordered tumor vessels and irregular shape were observed in 4 patients with moderateinvasive risks, and 3 of them showed heterogeneity stained tumor. Obvious enlarged and disordered tumor vessels, unclear edge and uniform tumor staining were showed in 6 patients with highinvasive risks.
Conclusions The higher invasive risks correlates with more irregular and disorder tumor vessels.  The tumors with lowerinvasive risks have more regular and trim blood vessels.