Unusual False Positive on ^99mTc-Tektrotyd Scintigraphy Mimicking Bone Metastasis

Area of Science:

• Nuclear medicine
• Oncology
• Radiology

Background:

• Somatostatin receptor scintigraphy is crucial for neuroendocrine tumor (NET) staging.
• False positives can reduce the specificity of this diagnostic imaging technique.
• Accurate staging is vital for effective therapeutic evaluation of NETs.

Purpose of the Study:

• To report an incidental finding during somatostatin receptor scintigraphy.
• To highlight a potential cause of false positives in NET imaging.
• To illustrate the diagnostic challenges in interpreting scintigraphy results.

Main Methods:

• Utilized 99mTc-Tektrotyd scintigraphy for staging a patient with a neuroendocrine tumor.
• Analyzed imaging findings for incidental pathologies.
• Correlated imaging results with clinical presentation.

Main Results:

• An incidental vertebral hemangioma was detected on 99mTc-Tektrotyd scintigraphy.
• The finding occurred in a 34-year-old male undergoing staging for a well-differentiated ampullary neuroendocrine tumor.
• This highlights a potential source of false-positive interpretation.

Conclusions:

• Vertebral hemangiomas can present as incidental findings on somatostatin receptor scintigraphy.
• Such findings may mimic or contribute to false positives in neuroendocrine tumor evaluation.
• Careful interpretation is necessary to differentiate true pathology from incidental findings.