epignathus

e·pig·na·thus

(ē-pig'na-thŭs),
Unequal conjoined twins in which the smaller, incomplete parasite is attached to the larger autosite at the lower jaw. See: conjoined twins.
[epi- + G. gnathos, jaw]
References in periodicals archive ?
Other terms--choristoma, hamartoma, heterotopia, epignathus, and dermoid--refer to separate, unique entities that are not covered here.
Three-dimensional scanning augmented with color blood flow imaging cinched the diagnosis of epignathus.