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Uncommon Causes of Thyrotoxicosis^*

¹ Division of Nuclear Medicine and Molecular Imaging Program at Stanford, Department of Radiology, Stanford University Hospital and Clinics, Stanford, California; ² Nuclear Medicine, Cairo University, Cairo, Egypt; and ³ Nuclear Medicine, Saad Specialist Hospital, Al Khobar, Saudi Arabia

View larger version (50K): [in this window] [in a new window]   FIGURE 1.  Pertechnetate flow and static images over cervical region after intravenous injection of 185 MBq (5 mCi) of 99mTc. Flow images (left) were obtained every 3 s, and static image (right) was obtained after delay of 10 min. There was no thyroid trapping of 99mTcO4.

View larger version (13K): [in this window] [in a new window]   FIGURE 2.  Algorithm for diagnosing different forms of thyrotoxicosis with low uptake. (A) Importance of measuring uptake and checking technical factors that could cause false-positive outcome. (B) Painful thyroid glands with low uptake. ESR = erythrocyte sedimentation rate. (C) Painless thyroid glands.