"Question ID","Question","Discussion","Answer","Year" "20130192","MP/H Rules/Histology--Pleura: How is histology coded when the pathology report final diagnosis is ""malignant neoplasm, compatible with malignant mesothelioma"" if the COMMENT section of the pathology report indicates the tumor has a mixed epithelial and sarcomatoid pattern? See Discussion.","This case was discussed with a pathologist who feels the correct histology should be biphasic mesothelioma (9053/3) because there are both epithelial and sarcomatoid components to this tumor. However, applying the current MP/H Rules, the histology is coded to 9050/3 (mesothelioma, NOS) because the term ""pattern"" cannot be used to code a more specific histologic type for invasive tumors. If this truly is a biphasic mesothelioma, that data is lost for researchers because the current MP/H Rules fail to capture this information. Should the term pattern be used to code the more specific histology in this case?","Code the histology to malignant mesothelioma, NOS [9050/3]. Apply the MP/H Rules as written until they are revised. The word ""pattern"" and other terms will be reconsidered for the next iteration of the rules.","2013"