Purpose: To report the thinnest peak endometrial thickness to date resulting in a viable fetus following embryo transfer. Methods: Mild ovarian hyperstimulation was given to a 35-year-old woman with not only a family history of premature ovarian failture but she also had diminished egg reserve. Resuts: She consistently could not attain more than a 4 mm endometrial thickness in graduated estro-gen replacement cycles or IVF-ET cycles. She successfully conceived on her second oocyte retrieval but first embryo transfer despitei maximum endometrial thickness of 3.7 mm; we believe this is the thinnest one to date associated with a viable prcegnancy following embryo transfer. Conclusions: Anecdotal cases are important to help couples make appropriate choices for their therapy. A physician could simply recommend a very expensive gestational carrier. However precedents might allow a given couple to take a chance with their ideal goal despite slim odds rather than compromise with a distant second choice.