Thyroidal in a sentence as an adjective

I know that when they give Iodine 131 pills to to fight thyroidal gland cancer the patient must be isolated from everyone else because he is radio active. But other than that this doesn't make any sense.

Thyroidal definitions

adjective

of or relating to the thyroid gland; "thyroid deficiency"; "thyroidal uptake"

See also: thyroid