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I.緒言
著者は,数年前に,コロムビア大学のInstituteof Ophthalmology of Presbyterian Hospitalにある米国人の網膜芽細胞腫Retinoblastomaの標本の中から,その一部150例について病理組織標本を見る機会があつた1)。その後,教室にある同疾患の標本を見ているうちに,日本人の網膜芽細胞腫ではロゼット形成の頻度が低いのではないかという印象をもつようになつた。そこで,主として昭和25年以降の教室の材料についてロゼット形成をしらべて,彼の国の材料と比較してみた。それは,同じ著者が,異つた国,異つた民族に於ける材料と,自国の材料とを同じ観点にたつて観察比較する機会は少ないと思われるし,又,興味のある事とも思えたからである。
Thirty eyes with retinoblastoma from 29 cases were histopathologically analyzed. Tu-mors were classified into 3 types : well diffe-renciated, less differenciated and mixed. Th-ese tumors in which rosettes were found to cover more than one-half of the area were designated as well differenciated. Less diffe-renciated, or pure retinoblastoma, comprised that group with only a few rosettes in the tumor or with no rosettes formation ; while the mixed type was defined as that tumor in which the formation of rosettes was not predominant or in which the area of rosettes comprised less than one-half of the tumor.
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