A sentinel node biopsy is best described as which type of procedure?

A sentinel node biopsy is best described as which type of procedure?

• A. Surgical biopsy of the primary tumor
• B. Nuclear medicine procedure to assess axillary lymph nodes
• C. Imaging study to map breast ducts
• D. Biopsy of a non-palpable mass

Answer: (B)

The main idea being tested is that sentinel node biopsy uses a radioactive tracer to map the breast’s lymphatic drainage and identify the first lymph node(s) that receive tumor drainage—the sentinel node—for targeted biopsy. This mapping and localization rely on nuclear medicine techniques (lymphoscintigraphy and intraoperative radiotracer detection with a gamma probe) to determine which node should be removed for pathologic evaluation. The procedure combines this nuclear medicine step with a surgical biopsy of the identified node, but its purpose is to assess axillary nodal status with minimal disruption, rather than sampling the primary tumor or performing a standard imaging study of ducts. In this sense, it is best described as a nuclear medicine procedure to assess axillary lymph nodes, guiding the surgical biopsy of the sentinel node.

The main idea being tested is that sentinel node biopsy uses a radioactive tracer to map the breast’s lymphatic drainage and identify the first lymph node(s) that receive tumor drainage—the sentinel node—for targeted biopsy. This mapping and localization rely on nuclear medicine techniques (lymphoscintigraphy and intraoperative radiotracer detection with a gamma probe) to determine which node should be removed for pathologic evaluation. The procedure combines this nuclear medicine step with a surgical biopsy of the identified node, but its purpose is to assess axillary nodal status with minimal disruption, rather than sampling the primary tumor or performing a standard imaging study of ducts. In this sense, it is best described as a nuclear medicine procedure to assess axillary lymph nodes, guiding the surgical biopsy of the sentinel node.