Chromosomal analysis of spermatozoa with normal-sized heads in two infertile patients with macrocephalic sperm head syndrome.

Objective: To study the chromosomal content of spermatozoa that could be selected for intracytoplasmic sperm injection (ICSI) in cases of macrocephalic sperm head syndrome.

Design: Case report.

Setting: Obstetrics, gynecology, urology, and reproductive biology departments.

A histomorphometric and cytogenetic study of testis from men 29-102 years old.

Objective: To evaluate the influence of aging on testicular histology and the aneuploidy rate in testis postmeiotic cells.

Design: Comparison between older men and younger men.

Setting: Deceased donors and patients who requested assisted reproductive technology (ART).