Fig. 1

CTA images of a Yorkshire Terrier on day 1 (a), day 35 (b), day 182 (c), and day 373 (d). The size of the thrombus in the main portal vein (arrow) remained unchanged; the volume of ascites (arrowheads) before (a) and after (b) treatment with clopidogrel and spironolactone. On the two CTA images acquired after combined therapy with rivaroxaban and prednisolone (c, d), ascites was not detected and the thrombus size appears to have gradually reduced in the main portal vein (arrow). Asterisk, ameroid constrictor; S, stomach; CTA, computed tomographic angiography