radiocolloid lymphoscintigraphy

radionuclide lymphoscintigraphy scintigraphy of the lymph nodes following the administration of radiocolloid, usually labeled with technetium 99m, which migrates to the lymph nodes, where it is retained by phagocytosis; uptake of the tracer is decreased in nodes containing metastatic tumor.

Radionuclide lymphoscintigraphy demonstrating multiple routes of lymphatic drainage after injection of radiocolloid around a cancer site in the right breast, including into the right axilla (upper arrow), internal mammary node (lower arrow), and an inframammary node.