cancer secondary malignant neoplasm MEDGEN:473807 ICD9:199.1 Note that we currently treat secondary neoplasms as being neoplastic diseases that are derived from neoplasm; classes such as 'neoplasm', 'carcinoma' are implicitly primary. This may change in future. A malignant neoplasm that arises from a pre-existing lower grade lesion, or as a result of a primary lesion that has spread to secondary sites, or due to a complication of a cancer treatment. SCTID:128462008 ICD9:198.89 EFO:0009812 UMLS:C3266877 secondary malignant neoplasm NCIT:C4968 secondary malignancy secondary cancer secondary neoplasm