99mTcO4 visualization of septic pulmonary emboli during thyroid scintigraphy

Area of Science:

• Nuclear Medicine
• Radiopharmacology
• Infectious Disease Imaging

Background:

• Subclinical hyperthyroidism diagnosis often involves routine thyroid scintigraphy using agents like technetium-99m pertechnetate (99mTcO4).
• Septic emboli can manifest in various locations, posing diagnostic challenges.
• Thyroiditis can alter radiotracer uptake patterns.

Observation:

• An unusual thoracic accumulation of 99mTcO4 was observed during a thyroid scintigraphy procedure.
• The observed pattern was initially interpreted as potentially indicative of septic emboli and concurrent thyroiditis.
• The patient was undergoing evaluation for subclinical hyperthyroidism.

Findings:

• Post-treatment scintigraphy with 99mTcO4 demonstrated complete resolution of the thoracic foci.
• The resolution strongly suggests the initial thoracic accumulation was indeed due to septic emboli.
• The findings highlight the dynamic nature of infectious processes visualized with nuclear imaging.

Implications:

• This case underscores the importance of considering infectious etiologies when unexpected radiotracer accumulations are noted.
• Nuclear medicine imaging, particularly with 99mTcO4, can be valuable in diagnosing and monitoring infectious complications.
• Effective antibiotic therapy led to the successful resolution of septic emboli, as evidenced by serial imaging.