胎兒磁共振成像胎兒頭顱MRI檢查

1、會計(jì)學(xué)1胎兒磁共振成像胎兒頭顱胎兒磁共振成像胎兒頭顱MRI檢查檢查Limperopoulos C, et al. AJR Am J Roentgenol 2008; 190:16371643. Total fetuses MRI abnormal 90 60 (67%)Comparison of antenatal and postnatal MR findings in 39 of 42 live born infantsComplete agreement 23 (59%)Disagreement 16 (41%) Excluded fetal MRI 6 (15%) Revealed a

2、dditional abnormalities 10 (26%) 1112W 1314W 16W 18W 17.5w 21w 22w 24w 27w Normal AbnormalTengmento-vermian angle22week fetusA. axial sonography showed a large cystic posterior fossa with small cerebellar hemispheres.B. the tegmento-vermian angle is increased with the fourth ventricle uncovered . Th

3、e vermis is very small; there is no primary fissure or fastigial point.C. Diagrammatic representation of DWC.D. the cerebellar hemispheres are small.The ventricular system is dilated, resulting in large temporal horns22week fetusSonography and MRI findings are similar to the previous case except tha

4、t the cerebellar hemispheres seems larger and vermian tisse can be seen in the midline.Craniocaudal diameterCraniocaudal diameter (perpendicular to fastigial point-declive line)28-week fetusThe craniocaudal diameter of vermis measures 10.9mm (equivalent of 22 weeks). The expected measurement is 14.8

5、mm. The transcerebellar diameter is also small.14.9mm12.3mm9.8mm23-week fetus36-week fetus大枕大池枕大池蛛網(wǎng)膜囊腫29-week fetus5-month 17.5w 21w 22w 24w 27w22week fetusA. axial sonography showed a large cystic posterior fossa with small cerebellar hemispheres.B. the tegmento-vermian angle is increased with the fourth ventricle uncovered . The vermis is very small; there is no primary fissure or fastigial point.C. Diagrammatic representation of DWC.D. the cerebellar hemispheres are small.The ventricul