W have evaluated the post-embolization findings of hepatic tumors(15 cases of hepatoma, and 5 cases of metastatic tumors) using lvalon particles in conjuction with the pre-embolization status of computed tomograpahy. Serial CT examinations were done every 3 week intervals after embolization precedure. Findings were as follows : 1. In hepatoma, tumor volume was decreased in 7 cases at 3 week after procedure. Among which 5 cases revealed tumor volume decrease of 0 to 25 percent. 2. Most important findings of post embolized hepatic tumors was decreased tumoral density and attenuation of tumor wall enhancement. 3. In tratumoral air was developed within 3 week after embolization and appeared as mottled or linear branching patterns in the center or periphery of the tumor. 4. It seems to be important to observe the change of intratumoral density and measurement of tumoral volume to determine the reembolization procedure.