抄録
Histopathological studies on 23 cases of embryonal hepatoma are presented and summarized as follows:
1. The characteristics of neoplastic cells and neoplastic tissue of embryonal hepatoma were briefly described.
2. The structures which might be considered as compatible with the appearance of the so-called osteoid in the literature were found, variable in size, within the tumor tissue in 11 cases.
3. The conspicuous features were completely traced in process of their formation and were concluded to be hyalinously modified pattern of stromal connective tissue, just like localized cylindroma. There was no relation between bone and this hyalinous structure. It hardly seemed reasonable to put the cases submitted for the present study into the group of hepatic mixed tumor.
4. The presence of hematopoietic foci mainly composed of erythrocytic immature cells was observed within the neoplastic tissue in 9 cases.
5. These foci were considered to be formed in the dilated capillaries within the neoplasm by the influence of the neoplastic cells originating from hepatic cells.
6. Histogenesis of both particular findings, distinctly different from those of hepatoma in adult, in embryonal hepatoma was discussed with respect to tissue induction.
