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To the Editor.—
"Pilomatrixoma" is just as bad a word formation as "appendixitis" would be. Just as the root (from which other words are formed) of "appendix" is appendic-, not appendix-, so also the root of "matrix" is properly "matric-." The word should be spelled, as Hermann Pinkus pointed out a year or two back, "pilomatricoma." Just because Gould's Medical Dictionary has it wrong is no excuse. They'll correct it in their next edition.
Arnold HL. Pilomatrixoma. Arch Dermatol. 1974;109(5):736. doi:10.1001/archderm.1974.01630050070027