Origin and outcome of pregnancies affected by androgenetic/biparental chimerism.

Background: Androgenetic diploid cells confined to the placenta have recently been reported in several cases of normally developed fetuses in association with placental mesenchymal dysplasia (PMD).

Methods And Results: We investigated two singleton, mildly growth-restricted, female pregnancies ascertained on the basis of PMD. One case had liver hemangiomas and both infants had multiple skin hemangiomas.

Analysis of early meiotic events and aneuploidy in nonobstructive azoospermic men: a preliminary report.

Objective: To study the events of spermatogenesis in azoospermic men by examining meiosis I spermatocytes and postmeiotic spermatozoa.

Design: A preliminary analysis of synaptonemal complex (SC), recombination, and chromosomal constitution (meiotic and postmeiotic) in testicular tissue.

Setting: Academic research environment.