Barr M, Heidelberger K P, Dorovini-Zis K
Teratology. 1986 Apr;33(2):153-7. doi: 10.1002/tera.1420330203.
Prenatal ultrasonography at 24 weeks disclosed a fetus with a large mass protruding from the occiput. The mass was an invasive, undifferentiated mesenchymal neoplasm of the scalp associated with a defect in the occipital bone (cranium bifidum). The tumor may have derived from neural crest at the site of rhombencephalic closure. The tumor itself would seem to be a sporadic event, but the cranium bifidum may imply a recurrence risk of 2-3% for future pregnancies.
孕24周时的产前超声检查发现一个胎儿，其枕部有一个巨大肿物突出。该肿物是头皮的一种侵袭性、未分化间叶性肿瘤，伴有枕骨缺损（脑膨出）。肿瘤可能起源于菱脑闭合部位的神经嵴。肿瘤本身似乎是一个散发性事件，但脑膨出可能意味着未来妊娠有2%-3%的复发风险。
