Evaluation of hyperechoic liver tumors in MHTS.

Hepatocellular carcinoma (HCC) shares only a small proportion of hyperechoic liver tumors detected in MHTS and mimics hemangioma on ultrasonography (US). The precise diagnosis of HCC is hence difficult in MHTS, but presence or absence of underlying chronic liver disease and serum alfa-fetoprotein (AFP) titer might provide useful informations.

Abnormal persistence of the right vitelline vein.

The authors describe a case of intestinal obstruction due to a mesodiverticular band, in which both vitelline artery and vein remnants were affirmed to be present histologically. Reviewing case reports in literature, it was revealed that the vein found in the band was the right vitelline vein remnant and that this was an important fact which proved the hypothesis that the superior mesenteric vein derives from the right vitelline vein.