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Incidental Breast Uptake of Thallium-201 on Myocardial Scintigraphy in a Lactating Woman: Case Report

It was not common that a lactating woman with bilateral breast uptake of 201Tl-thallous chloride (201Tl) on myocardial scintigraphy. We reported such a case. The 38-year-old woman with a one-year-old lactating infant suffered from intermittent chest distress for several months. Electrocardiogram showed intermittent ventricular tachycardia. 201Tl myocardial perfusion scintigraphy was performed and revealed normal perfusion to all segments on stress and rest images. However, there was bilateral breast uptake of 201Tl on delayed 4-h images. Carefully clinical examinations and follow-up studies showed no evidence of breast disease. The enhanced 201Tl uptake of breast was related to lactation and might be due to diffusion of 201Tl into the extravascular space.