Incidental Detection of Thyroid Neoplasm on 99mTc-SestaMIBI Myocardial Perfusion Scan - A Novel Tumour Tracer Revisted

We report a case of a young Indian male who had an incidental abnormal focal uptake of 99mTechnetium-MIBI (Methoxy Isobutyl Isonitrile) in the right lobe of thyroid while undergoing 99mTc-MIBI myocardial perfusion gated SPECT (Single Photon Emission Computed Tomography) imaging as a part of his myocardial ischemia status evaluation. This focal uptake was eventually detected to be a malignant thyroid nodule for which he underwent total thyroidectomy. His biopsy was reported as Hurthe cell nodule. Though incidental detection of thyroid, breast and lung malignant pathology on 99mTcMIBI myocardial perfusion scans is well known, this case is a reminder and exemplifies the potential of 99mTc-MIBI not only as an excellent myocardial perfusion agent but also as a non specific tumour tracer (for its larger usage as a tracer for neoplastic survey).