This is a rare condition that has been reported in fewer than 100 individuals throughout the world.

The couple have had four children, all of which were still born due to a rare condition.

It is an extremely rare condition, with few reported cases in the history of modern medicine.

He had a known, quite rare, condition which explained this.

Not a particularly rare condition in a well, made, personable and probably only son.

Other relatively rare conditions have been reported in association with this disease.

Like I told you at lunch, she has some rare cardiac condition.

It is a very rare condition with about 30 known cases in 2002.

He wanted to screen me for a rare genetic condition.

This rare condition has only been studied in depth since 1968.