Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


_Implantation cysts_ are caused by the accidental transference of
portions of the epidermis into the underlying connective tissue, as may
occur in wounds by needles, awls, forks, or thorns. The implanted
epidermis proliferates and forms a small cyst. They are met with chiefly
on the palmar aspect of the fingers, and vary in size from a split pea
to a cherry. The treatment consists in removing them by dissection.


_Parasitic cysts_ are produced by the growth within the tissues of
cyst-forming parasites, the best known being the taenia echinococcus,
which gives rise to the _hydatid cyst_. The liver is by far the most
common site of hydatid cysts in the human subject.

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