Aberrant Thyroid Tissue in the Mouse

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Science  13 Sep 1963:
Vol. 141, Issue 3585, pp. 1054-1055
DOI: 10.1126/science.141.3585.1054


Aberrant thyroid tissue was observed at the base of the heart in seven of 2634 mice of the BALB/c strain. Such tissue was not seen in any of 1033 mice of the Strong A strain. The normal thyroid gland of the BALB/c mouse was observed to be more loose than that of the Strong A mouse and isolated follicles were frequently observed in tissue sections at either pole of the gland which were not attached to the body of the thyroid.