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腹膜リンパ腫症(peritoneal lymphomatosis:PL)は,びまん性の腹膜,大網,腸間膜病変を特徴とする非ホジキンリンパ腫(non-Hodgkin lymphoma:NHL)のまれな病態であり,PLで発症したリンパ腫の節外浸潤は一般的に予後不良とされている1-3)。PLをきたした症例は大多数が成人であると報告されており,小児発症例は少ない4)。
We experienced a rare case of peritoneal lymphomatosis in a 5-year-old girl and investigated its morphological characteristics. The tumor diffusely infiltrated the peritoneum and omentum, had smooth margins, and had a relatively smooth parenchyma, without showing nodular or lumpy morphology. The morphological characteristics were clearly depicted by MRI. Administration of anticancer drugs for lymphoma, primarily steroids, led to a significant reduction in tumor size approximately two weeks after treatment. We report a case of pediatric malignant lymphoma in which characteristic imaging findings suggested the possibility of peritoneal lymphomatosis, enabling its early diagnosis and treatment.

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