Baijal Noopur, Sahni Mohit, Verma Neeraj, Kumar Amit, Parkhe Nittin, Puliyel Jacob M
Department of Pediatrics and Neonatology St Stephens Hospital, Tis Hazari, Delhi 110054, India.
BMC Pediatr. 2007 Jan 19;7:2. doi: 10.1186/1471-2431-7-2.
Documentation of superfoetation is extremely rare in humans., The younger foetus has invariably been small for gestational age (estimated from the date of the last menstrual bleed) in all the cases reported in the literature. We report a case where the younger twin was of appropriate size for gestation.
The first of twins was of 32 weeks gestation and the baby was of appropriate size and development for the gestational age. The second twin was of 36 weeks gestation. Gestational age was estimated with the New Ballard score, x-ray of the lower limbs, dental age on x-ray, and ophthalmic examination.
Bleeding on implantation of the first foetus probably helped demarcate the two pregnancies. Dental age and the New Ballard score can be used to diagnose superfoetation in discordant twins, when detailed first trimester ultra-sound data is not available.
人类异期复孕的记录极为罕见。在文献报道的所有病例中，较年幼的胎儿相对于孕周（根据末次月经出血日期估算）而言总是偏小。我们报告一例较年幼的双胞胎胎儿大小与孕周相符的病例。
双胞胎中的第一个胎儿孕周为32周，其大小和发育与孕周相符。第二个双胞胎胎儿孕周为36周。通过纽巴拉德评分、下肢X光、X光片上的牙齿年龄以及眼科检查来估算孕周。
第一个胎儿着床时的出血可能有助于区分这两次妊娠。当无法获得详细的孕早期超声数据时，牙齿年龄和纽巴拉德评分可用于诊断不一致的双胞胎中的异期复孕情况。
