Leukemia is a rare complication of pregnancy. Forkner,1reviewing the literature up to 1938, found 53 cases reported and of these the diagnosis was questionable in 5 instances. Presenting 1 of their own, Grier and Richter2in 1939 were able to collect a total of 75 cases, but 13 of these were mentioned only bibliographically. We discovered another reported by Bentivoglio3in 1936 which was not included in this series. From 1939 to the present writing there have been 2 additional cases reported in the foreign literature.4These, with the 1 described here, bring the present total reported up to 79. In our case chronic myelogenous leukemia was discovered early in pregnancy and undoubtedly preceded gestation. The disease was also complicated by preeclamptic toxemia. The mother was successfully delivered of a living normal child by cesarean section. REPORT OF CASE Mrs. H. M., aged 32, white,