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NBME 23 Answers

nbme23/Block 2/Question#8 (26.0 difficulty score)
An 8-year-old boy is brought to the physician ...
Serum calcitonin concentration🔍

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submitted by mousie(160),
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aiofrdMna usaitbh + Mlscaou onemsrua + eNck amss = NEM B2 P(MM) oPeh, yeMldralu hroytid CA tonaiCilc(n i)tngce,sre osaulmc mnureoas

thotcandy  I knew it was MEN2B but forgot medullary ca of Thyroid is parafollicular/c cells which means Calcitonin, not T3/T4 Other answers: AntiThyroglobulin: Hashimoto's (or other thyroiditis) Dexamethasone suppression test: positive/suppressed in pituitary adenoma (acth secreting), negative/unresponsive in Adrenal hyperplasia/adenoma (suppressed by high dose) or ectopic acth (unresponsive to high dose) Serum TSH test: for papillary or follicular ca, thyroid adenomas are usually cold but could also cause HyperT TSHR antibodies: graves disease, hyperT +1