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We report on a fetus with a congenital pulmonary myofibroblastic tumor, the prenatal detection of which with imaging modalities has not been reported up until now. A 32-year-old woman was referred to our hospital at 29 weeks' gestation because of severe fetal hydrops. Sonograms and magnetic resonance imaging showed a large solid tumor in the left thorax. The fetus died in utero the next day. Autopsy confirmed that the tumor was confined to the lower lobe of the left lung, and circulatory insufficiency from compression by the tumor was considered to be the cause of fetal hydrops and demise. Histologic examination revealed that the tumor was composed of uniform short spindle cells with no atypia and a large number of vessels. In addition, with immunohistochemical studies, the tumor cells were stained for calponin but not for cluster differentiation (CD)-31, CD-34, alpha-smooth muscle actin or S-100.

We report two cases of fetofetal transfusion in monochorionic triamniotic triplet pregnancies. Case 1: At 23 weeks' gestation an amnioreduction was carried out. Three days later, the donor triplet died in utero. Immediately after that, a cardiotocogram of the triplet who had been thought to be unaffected by the fetofetal transfusion, showed a non-reassuring fetal status. Although cesarean section was carried out, none of the triplets survived. Case 2: At 24 weeks' gestation a woman was transferred to our center because of fetofetal transfusion in monochorionic triplets. Cesarean section was carried out. However, the recipient died on the 75th day after birth, and the others had neurological problems. Previous reports on fetofetal transfusion in triplets are very limited. The prognosis of this condition has been reported to be severe, irrespective of chorionicity, gestational age at delivery, maternal age, and parity. When managing a monochorionic or dichorionic triplet pregnancy, serial and careful ultrasound examination is mandatory to find early symptoms of this serious condition.

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