invasive tumor
Medical term for a tumor that invades surrounding tissues.
Invasive tumors have the property of spreading into surrounding tissues.
悪性腫瘍 is a broader term for malignant tumors, while 浸潤性腫瘍 specifically emphasizes the invasive behavior.
Compound of 浸潤 (infiltration) + 性 (nature) + 腫瘍 (tumor).