CH12SZZ
Planar Nuclear Medicine Imaging Breasts, Bilateral to None with None, Thallium 201 (Tl-201) Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | C Nuclear Medicine |
| Body System | H Skin, Subcutaneous Tissue and Breast |
| Operation | 1 Planar Nuclear Medicine Imaging |
| Body Part | 2 Breasts, Bilateral |
| Approach | S Thallium 201 (Tl-201) |
| Device | Z None |
| Qualifier | Z None |
Operation Definition
Introduction of radioactive materials into the body for single plane display of images developed from the capture of radioactive emissions
Procedure Overview
This family covers single-plane radioactive imaging of the skin, subcutaneous tissue, and breast, most commonly lymphoscintigraphy performed to map lymphatic drainage before breast cancer or melanoma surgery. A radioactive tracer, typically technetium-99m sulfur colloid, is injected near the tumor or biopsy site, and a gamma camera captures flat images as the tracer travels through lymphatic channels toward the first draining lymph nodes.
Surgeons use these images to identify and mark the sentinel lymph node, the first node a tumor would spread to, so it can be removed and examined during surgery instead of removing an entire chain of lymph nodes unnecessarily. The scan is typically done the same day as surgery or the day before, and the images are often paired with a handheld gamma probe used in the operating room to physically locate the marked node.
Anatomy & Axis Detail
Breasts, Bilateral
Bilateral breast planar imaging is used when both breasts are studied in the same nuclear medicine encounter, a scenario less common in routine sentinel node mapping, which is typically unilateral to the known tumor side, but relevant when screening or comparative evaluation of both breasts is clinically indicated. The planar technique still yields flat, two-dimensional images per view rather than volumetric slices, so interpretation relies on relative symmetry and pattern comparison between sides. Coding this bilateral value requires that the procedure genuinely addressed both breasts within a single session rather than two separate unilateral studies performed on different dates. Documentation should make clear that imaging fields included both breasts to justify use of the bilateral body part value over sequential right and left codes.
Radionuclide: Thallium 201 (Tl-201)
Thallium 201 (Tl-201) identifies studies using this radionuclide, historically significant for myocardial perfusion imaging because it is taken up by viable heart muscle in proportion to blood flow. It has largely been supplemented by technetium-based agents for cardiac imaging but remains coded distinctly when used, differing from Tc-99m tracers and from positron-emitting isotopes used in PET perfusion studies.
Coding & Documentation
A code from this family requires documentation of the tracer injection near the breast or skin lesion and confirmation that flat, single-position images were obtained showing lymphatic drainage pathways and node uptake, without a rotational SPECT component. The most frequent coding error is applying this code when only the intraoperative gamma probe was used to find the node, since the probe-guided localization without preceding preoperative planar imaging does not meet this root operation. Another common mistake is misclassifying the body system when the drainage pattern documented actually centers on a lymph node basin elsewhere in the body rather than the breast or skin site itself.
Commonly Confused With
This family is frequently confused with Tomographic Nuclear Medicine Imaging when a SPECT/CT lymphoscintigraphy was performed instead of a planar-only study, since SPECT/CT gives better anatomic localization in obese patients or complex drainage patterns. It is also distinguished from Lymphatic and Hemic System nuclear medicine imaging, which applies when the primary structure being evaluated is a lymph node group unrelated to a breast or skin lesion rather than the drainage from a skin or breast site.