choristoma cho·ris·to·ma (kôr'ĭ-stō'mə)
n.
A mass formed by the faulty development of tissue of a type not normally found at that site.
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
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