The procedure-related fetal loss rates in pregnant women ≥35 years old after amniocentesis before 24 and 28 complete weeks were 0.17 and 0.50%, respectively. The certain factors influencing the risk of fetal loss might be independent of the amniocentesis procedure.

Fetal trisomy 16 is considered uniformly lethal early in gestation. It has been reported to be associated with the variability of clinical features and outcomes. Mosaic trisomy 16 leads to a high risk of abnormality in prenatal cases. Intrauterine growth retardation (IUGR) is a common outcome of mosaic trisomy 16. Herein, we report on the case of Thai male IUGR fetus with trisomy 16 mosaicism. The fetal body was too small. Postmortem investigation of placenta revealed the abnormality including small placenta with furcated cord insertion and single umbilical cord artery. Cytogenetic study demonstrated trisomy 16 that was found 100% in placenta and only 16% in the fetal heart while other organs had normal karyotype. In addition, cardiac and other internal organs examination revealed normal morphology.

Megalourethra is a rare congenital anomaly characterized by dilatation of the penile urethra which causes functional obstruction of the lower urinary system. We present a case of congenital megalourethra diagnosed prenatally. Transabdominal sonography revealed a male fetus with bilateral hydroureter, hydronephrosis, dilated bladder and normal amniotic fluid. The fetal penis was enlarged and the penile urethra was dilated with ballooning at the distal end. The urethral meatus was identified. The fetus was delivered at term with a favorable outcome.