Micropapillary thyroid carcinoma and concomitant ectopic thyroid tissue in the adrenal gland: metastasis or metaplasia?
Here we present the seventh known case of ectopic thyroid tissue in the adrenal gland and the first case of concomitant incidental PTMC in the setting of this ectopic tissue finding. Using this case, we discuss the diagnostic and therapeutic challenges faced and propose the use of biomarkers to help determine the metastatic potential of these tumors.
In the light of these findings we feel that the middle ear does not play a merely passive role in hearing but rather that the contraction of the endotympanic muscles makes possible variations in impedance such that the resonance frequency of the ear shifts towards higher frequencies, thus enhancing sound discrimination in noisy environments.