Cellular Pathology Pathology of Neoplasia . Nomenclature of neoplasia recognizes the pattern of differentiation (usually tissue or origin) and whether the tumor is benign or malignant. The suffix – oma usually indicates a benign tumor.
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Nomenclature of neoplasia recognizes the pattern of differentiation (usually tissue or origin) and whether the tumor is benign or malignant.
The suffix –oma usually indicates a benign tumor.
Exceptions: melanoma, astrocytoma, lymphoma, hepatoma.
The suffixes –carcinoma (epithelial origin) and –sarcoma (mesenchyme/stroma) always refer to malignant tumors.
There are 5 major patterns of differentiation (some tumors may have multiple patterns):
Hematopoietic: may be leukemia (blood) or lymphoma (lymph nodes), both are malignant.