Source : Webster's Revised Unabridged Dictionary (1913)

Encysted \En*cyst"ed\, a.
   Inclosed in a cyst, or a sac, bladder, or vesicle; as, an
   encysted tumor.

         The encysted venom, or poison bag, beneath the adder's
         fang.                                    --Coleridge.

Source : WordNet®

encysted
     adj : enclosed in (or as if in) a cyst