Lymphoscintigraphy and segmental lymphoscintigraphy
When is this exam indicated?
- in case of idiopathic lymphedema, to evaluate the drainage of the tracer in both limbs;
- breast cancer, to search for the first axillary or internal mammary chain lymph node station that could be affected by a secondary lesion (sentinel lymph node);
- melanoma, to search for the first lymph node station that could be affected by a secondary lesion (sentinel lymph node).
How is it performed?
Colloidal particles marked with Tc-99m pertechnetate are used; they are drained through the lymphatic system and reach the regional lymph node stations.
The radiopharmaceutical is injected under the skin at different points depending on the area to be examined: in the feet for the lower limbs, in the hands for the upper limbs, in the perilesional area to identify the sentinel lymph node.
Does not require preparation
The duration of the examination is about 2 hours.