We designed a spinal-type, ultrasound-guided, aspiration biopsy needle called the Y-needle to histologically diagnose hepatic tumors. We recently assessed the usefulness of this needle by comparing it to a Majima needle. The subjects of this study were 39 patients with hepatic tumors who underwent ultrasound guided aspiration biopsy using either the Y-needle or the Majima needle. Prior to the biopsy, these patients had been suspected of having the following diseases: 26 cases of hepatic hemangioma, 10 cases of hepatocellular carcinoma, one case of adenomatous hyperplasia, one case of cholangiocellular carcinoma and one case of hepatic angiomyolipoma. A biopsy using the Majima needle did not allow for a histological diagnosis of the hepatic hemangioma, although such a diagnosis was possible in 8 of the 17 cases of hepatic hemangioma biopsied using the Y-needle. The Y-needle also seemed to make possible histological diagnosis of hepatocellular carcinoma. Moreover, in some cases involving other hepatic tumors, the Y-needle also seemed to be useful. These results indicate the usefulness of Y-needle in the ultrasound-guided, aspiration biopsy of hepatic tumors.