Renal casts

from The Collaborative International Dictionary of English v.0.48

Renal \Re"nal\ (r[=e]"nal), a. [L. renalis, fr. renes the
   kidneys or reins: cf. F. r['e]nal. See {Reins}.] (Anat.)
   Of or pertaining to the kidneys; in the region of the
   kidneys.
   [1913 Webster]

   {Renal capsules} or {Renal glands}, the suprarenal capsules.
      See under {Capsule}.

   {Renal casts}, {Renal colic}. (Med.) See under {Cast}, and
      {Colic}.
      [1913 Webster]