Zalel Yaron, Lehavi Ofer, Aizenstein Orna, Achiron Reuwen
Ultrasound Unit, Department of Obstetrics and Gynecology, The Chaim Sheba Medical Center, 52621 Tel Hashomer, Israel.
J Ultrasound Med. 2006 Nov;25(11):1397-401; quiz 1402-3. doi: 10.7863/jum.2006.25.11.1397.
The purpose of this study was to perform high-resolution sonographic examinations to determine the normal anatomic relationship of the conus medullaris (CM) of the spinal cord with the vertebral column during different stages of gestation.
In this prospective study, fetal sonographic evaluations were performed between 13 and 40 weeks' gestation. Transvaginal probes (7.5-8 MHz) or abdominal probes (5-8 MHz) were used, depending on gestational age and position of the fetus. The CM was located in coronal longitudinal sections. The positions of the kidneys and lumbosacral junction and the origin of the ribs determined the location of the vertebrae. The locations of the CM were divided into 5 groups according to their positions relative to the vertebrae.
A total of 110 fetuses between 13 and 40 weeks' gestation were studied. Between 13 and 18 weeks' gestation, the CM was situated at the level of the L4 vertebra, or more caudally, in 100% of the fetuses. At term, all fetuses showed the CM above L2. A distinct ascent of the CM was detected between 13 and 40 weeks' gestation. The results were statistically significant (P < .0001).
A distinguishable ascent of the CM in relation to the vertebral column during fetal life was detected.
本研究的目的是进行高分辨率超声检查，以确定脊髓圆锥（CM）在妊娠不同阶段与脊柱的正常解剖关系。
在这项前瞻性研究中，对妊娠13至40周的胎儿进行超声评估。根据胎龄和胎儿位置，使用经阴道探头（7.5 - 8 MHz）或腹部探头（5 - 8 MHz）。在冠状纵切面上定位CM。肾脏、腰骶关节的位置以及肋骨的起始点确定椎体的位置。根据CM相对于椎体的位置将其位置分为5组。
共研究了110例妊娠13至40周的胎儿。在妊娠13至18周期间，100%的胎儿CM位于L4椎体水平或更靠尾侧。足月时，所有胎儿的CM均位于L2以上。在妊娠13至40周期间检测到CM有明显上升。结果具有统计学意义（P < .0001）。
在胎儿期检测到CM相对于脊柱有明显上升。
