After a total thyroidectomy, total-body imaging with radioiodine typically shows tracer concentration in which areas?

Following a total thyroidectomy, total-body imaging with radioiodine will typically show tracer concentration in the salivary glands, stomach, and bladder. This is due to the physiological behavior of iodine in the body.

Iodine is actively taken up by various tissues, and the salivary glands have a known ability to concentrate iodine since they play a role in secreting iodine-rich saliva. The stomach also shows uptake because it contains gastric mucosa that can absorb iodine. As for the bladder, radioiodine is excreted through the kidneys into the urine, leading to accumulation in the bladder. This pattern is expected after the thyroid gland has been removed, as there are no remaining thyroid tissues to uptake the iodine, thus leading to the tracer being concentrated in these other organs.

The other options include organs that either do not typically concentrate iodine or are not directly involved in its physiological handling, thus making them less relevant for this specific question.