Rule J. Change
the order of word roots in a compound term if the term is
not listed in ICD-O.
Some tumors have more than one histologic pattern. The most
common combinations have been listed in ICD-O, for example
"mixed adenocarcinoma and squamous cell carcinoma"
(M-8560/3), "papillary and follicular adenocarcinoma"
(M-8340/3), and "mixed basal-squamous cell carcinoma"
(M-8049/3).
The compound term "fibromyxosarcoma" is listed
in ICD-O with its code M8811/3, but "myxofibrosarcoma"
does not appear. "Myxofibrosarcoma" is the same
as "fibromyxosarcoma," except that the word roots
have been inverted, and it should therefore also be coded
M-8811/3. It was impossible to list all the combinations and
permutations of such compound terms. The coder must check
various permutations of the word roots in a compound term
if the version sought is not listed in ICD-O.
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