[The use of the CT-scan in the staging of neuroblastoma in childhood (author's transl)]

Thirty seven children with neuroblastoma were investigated by CT-scan. Twenty three of them underwent surgery allowing anatomical correlation. CT-scan was of little diagnostic help but proved very helpful in assessing the extent of the tumor: CT-scan and surgery were in agreement in 73% of the operated cases. CT is therefore an accurate means of predicting the operability of neuroblastoma.

Splenic granulopoiesis in mice following administration of cyclophosphamide

The adult mouse spleen retains granulocytic progenitor cells that are capable of proliferation and maturation. In mice given cyclophosphamide, spleen weight and cell content increased. In vitro granulocyte progenitor cells increased more than 300-fold in the spleen and remained elevated 14 days following cyclophosphamide. Proliferative and nonproliferative granulocytes were increased above controls until Days 21 and 28, respectively. In splenectomized mice, blood neutrophil recovery was delayed when compared to nonsplenectomized mice following cyclophosphamide. Although marrow cell number was similar in both groups, maximum marrow granulocyte progenitor cells were 2-fold greater in nonsplenectomized animals. These studies demonstrate that the murine spleen becomes a markedly granulopoietic organ and is a major contributor to recovery of granulocytes following cyclophosphamide. Splenic granulopoiesis should be taken into account in studies which measure toxicity of various agents in murine hematopoiesis.