Mahony B S, Callen P W, Filly R A, Hoddick W K
Radiology. 1984 Dec;153(3):773-6. doi: 10.1148/radiology.153.3.6387792.
Antenatal sonography routinely images the fetal cisterna magna. The identification of a prominent cisterna magna on a routine antenatal sonogram performed for obstetric indications may raise the question of a congenital posterior fossa lesion. To delineate the size of the fetal cisterna magna, standardized measurements for the midsagittal depth of the cisterna magna were prospectively obtained on 219 consecutive antenatal sonograms in fetuses of 15 menstrual weeks or more. The cisterna magna depth measured 5 +/- 3 mm; the largest cisterna magna measured 10 mm in depth. In the absence of other findings to suggest a posterior fossa lesion, a prominent cisterna magna is unlikely to be clinically significant.
产前超声检查通常会对胎儿的小脑延髓池进行成像。在因产科指征进行的常规产前超声检查中，若发现小脑延髓池明显增宽，可能会引发先天性后颅窝病变的疑问。为明确胎儿小脑延髓池的大小，我们前瞻性地对219例孕15周及以上胎儿的连续产前超声检查进行了小脑延髓池中矢状径的标准化测量。小脑延髓池深度测量值为5±3毫米；最大的小脑延髓池深度为10毫米。在没有其他提示后颅窝病变的发现时，明显增宽的小脑延髓池不太可能具有临床意义。
