We use thyroid scans to determine whether or not a cat is in fact hyperthyroid before proceeding with I-131 treatment. Below are thyroid scan images from two different cats, one who was positive for feline hyperthyroidism, the other negative. Without looking at the second picture below, can you tell the difference between the positive and negative images? (Click on each to view full-size versions.)

VICSD Feline Thyroid Scan Comparison

Here is the answer:

VICSD Feline Thyroid Scan Comparison


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