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[Value of thallium scintigraphy in thyroid pathology]
Summary
Thallium 201 (Tl 201) scintigraphy aids in diagnosing thyroid nodules. While effective for benign cases, Tl 201 shows a high false-positive rate for cancer detection, limiting its routine use.
Area of Science:
- Nuclear medicine
- Endocrinology
- Oncology
Background:
- Thyroid nodules require accurate diagnostic methods.
- Differentiating benign from malignant nodules is crucial for patient management.
- Technetium 99m (Tc 99m) and Thallium 201 (Tl 201) scintigraphy are used for thyroid imaging.
Purpose of the Study:
- To evaluate the diagnostic value of thallium 201 (Tl 201) scintigraphy in patients with thyroid affections.
- To compare Tl 201 scintigraphy with technetium 99m (Tc 99m) scintigraphy in identifying thyroid nodules.
- To assess the efficacy of Tl 201 in detecting thyroid cancer.
Main Methods:
- 45 patients with thyroid affections underwent scintigraphy using both Tc 99m and Tl 201.
- Histological confirmation was obtained for 43 thyroid nodules from 27 patients.
- Needle puncture cytology was performed in 11 cases.
Main Results:
- All nodules identified as "cold" by both Tc 99m and Tl 201 were benign.
- Tl 201 identified 28 "hot" nodules, with 8 (28.6%) confirmed as malignant.
- This resulted in a 72% false-positive rate for Tl 201 in detecting cancer, compared to 47% in existing literature.
- Tl 201 provided thyroid topography in benign conditions like Plummer's toxic nodules without additional tests.
Conclusions:
- Tl 201 scintigraphy is effective in identifying benign thyroid nodules.
- Tl 201 exhibits a high false-positive rate for thyroid cancer, necessitating caution in its interpretation.
- The gonadal toxicity of Tl 201 precludes its routine use in patients under 35.