Maternal manifestation of B allantyne's syndrome occurring concomitantly with the development of fetal congenital mesoblastic nephroma

Abstract Various fetal or placental disorders cause B allantyne's (mirror) syndrome. For the first time, we report a maternal manifestation of B allantyne's syndrome occurring concomitantly with the development of fetal congenital mesoblastic nephroma ( CMN ). In a pregnant woman with a CMN fetus, lung edema, hypertension, hyperthyroidism, and high serum human chorionic gonadotrophin level occurred, all of which characterize maternal manifestation of B allantyne's syndrome. The fetus and placenta were devoid of ‘edema’, lacking ‘triple edema’, and thus this condition was not diagnosed as B allantyne's syndrome; however, we considered this condition as the maternal manifestation of B allantyne's syndrome. We performed emergent cesarean section at 28 weeks. Delivery acutely ameliorated maternal symptoms. Tumor was resected and was confirmed as CMN . Maternal manifestations of B allantyne's syndrome, such as lung edema and hypertension, can occur in a mother with fetal CMN even without fetal and/or placental edema. The clinical course of this patient may suggest an etiology of B allantyne's syndrome.