I have been diagnosed as having hypothyroidism for over 10 years now, going along just fine, though always fighting weight. In May TSH was low (0.052 miu/ml, Free T4 wnl, lowered dosage of levothyroxine from 200mcg to 175mcg, July TSH 0.08, and Free T4 1.65 ng/dl, lowered again to 150mcg, TSH normal so back up to 175mcg of levothyroxine, however experiencing pain in neck so had a sonogram. Sonogram indicated 2 masses in neck, maybe parathyroid adenoma. Nov PTH tested normal. Oct TSH sensitive 0.37 uiu/ml (wnl). CBC etc all normal. November CT of neck with contrast indicates irregular focus of hydensedensity within the posterior aspect of the right lobe measuring approx. 8x6 mm in greatest transverse dimensions, as well as 4 enlarged lymph nodes of approx 1 cm in short axis. Dec tested THYROGLOBUL AB 23.1 U/ml (wnl), and THYROID PERO AB 27.0 (wnl), and TSI of 156, indicated as high (normal 0-129). What's going on? Scheduled appt with surgeon for biopsy of lymph nodes on Jan 15 and appt with endocrinologist on February 1. Are there other tests I should have done before seeing the endocrinologist? I don't know if this is Hashimoto's, Latent Graves (though no hyper evidence whatsoever), or..... Can anyone help point me in the right direction?