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Webster 1913 Edition

Adj.

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.

Adj.

[from cyst.] Inclosed in a bag, bladder or vesicle; as an encysted tumor.

encysted

encysted ‎(comparative more encysted, superlative most encysted)

(medicine) Contained in a cyst.
(figuratively) Embedded, enclosed.
- 2002, Colin Jones, The Great Nation, Penguin 2003, p. 545:
  This group included many who had been deeply encysted within the corporative fabric of the Bourbon polity – plus many for whom the chips did not fall well.