What is the significance of microvascular tumor invasion observed in a renal cell carcinoma?
The possible prognostic significance of intratumoral microvascular invasion by tumor cells has been mentioned sporadically over the past decade. All reports have determined that it is an adverse factor that negatively affects tumor recurrence or cancer-specific death. Its frequency is closely related to tumor size, Fuhrman nuclear grade, and pathologic stage. The presence of microvascular invasion may be more meaningful in predicting the prognosis in a low-stage, low nuclear grade tumor. For the pathologist, the presence (or absence) of tumor thrombus in a renal cancer mass should be stated in the pathology report. The ability to invade an intratumoral vessel must be a manifestation of aggressive biologic potential even for a tumor that is removed at an early stage of growth that is presumed to carry a favorable prognosis.
KeywordsNuclear Grade Tumor Thrombus Microvascular Invasion Microscopic Vascular Invasion Intratumoral Vessel
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