He was diagnosed with a rare form of blasto.

The blastocyst is the stage of development in which the embryo forms a fluid-filled cavity called the blastocoel.

The blastoderm is the single layer of cells that forms on the surface of the yolk in the early development of an embryo.

The blastocyte is a stage of early embryonic development.

The blastoff of the rocket was a spectacular sight.

The blastoffs were a spectacular sight.

The blastocoele is a fluid-filled cavity in the blastula stage of embryonic development.

The blastocoel is the fluid-filled cavity in a blastula.

The blastocoeles in the embryos were carefully examined.

The blastocoels are fluid-filled cavities in the blastula stage of embryonic development.