1. The pathological study on 19 cases of embryonal hepatoma of which gross specimens were submitted from various parts in Japan was presented with a survey of 40 cases of embryonal hepatoma reported from Japan in literatures available in review.
2. Comparison of the incidence of embryonal hepatoma between Japan and the United States was briefly discussed and the geographical distribution of the submitted cases of embryonal hepatoma in Japan was recorded.
3. The majority of embryonal hepatoma was predominantly noticed under 3 years of age.
4. There was no specific relation between hepatic cirrhosis and primary carcinoma of the liver in infancy and chldhood unlike in adult.
5. Main metastatic growth of embryonal hepatoma was observed in the lung.
6. All cases of embryonal hepatoma in the present study were microscopically recognized as liver cell carcinoma and their histological arrangements were observed to be mostly trabecular combined with closely packed pattern.
7. The so-called osteoid tissue and hematopoietic foci within the neoplasm were described as conspicuous histologccal findings of embryonal hepatoma.
Grateful acknowledgement is made to Professors Akazaki (Tohoku Univ.), Fuji-maki (Niigata Univ.), Hosokawa (Yamaguchi Univ.), Katsura (Iwate Univ.), Kawai (Gunma Univ.), Kawaji (Kagoshima Univ.), Miyagawa (Nagoya Univ.), Miyaji (Osaka Univ.), Ootaka (Tokyo Med. College) and Takizawa (Chiba Univ.) for the privilege of reviewing the necropsy records and generous supply of the autopsy material of embryonal hepatoma, and to Dr. Sano (Director of Department of Pathology, Institute for Science of Labour) for the preparing large section specimens of the submitted material.
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