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Uptake of pertechnetate in mammary tissue and thyroid after pregnancy.

Injected pertechnetate circulates in the blood pool, and is found in relatively high concentration in the salivary glands, thyroid, liver and stomach (ICRP, Publication No. 17). No references can be found of pertechnetate concentration in active mammary tissue. This phenomenon is now reported. The patient was first seen in the ante-natal clinic when the uterine size was that of a 16-week pregnancy, but was not seen again until she presented herself in established labour at term.