Missed Concepts

Workup of thyroid nodule almost always ends with FNA, the one exception is a patient without suspicious US findings or cancer risk factors, a low TSH, and a hot nodule on 123-Iodine scan (toxic adenoma). For these patients go straight to treatment (Methimazole pretreatment to achieve euthyroid > RF ablation vs. surgery)
Hashimoto thyroiditis can be associated with other autoimmune conditions such as atrophic gastritis (pernicious anemia).
During vitamin B12 repletion, you should monitor serum potassium, which can drop as new RBCs are formed.
Young, normal weight patient presents with symptomatic DKA? T1DM

Hypercalcemia