You may need to get the nodule biopsed.
Looks like your gland is enlarged which is what Hashi's does to it (makes it large and spongy) but the nodule on the left with increased vascularization needs to be watched closely.
Definition of Neoplasm
Neoplasm: A tumor. An abnormal growth of tissue. The word neoplasm is not synonymous with cancer. A neoplasm may be benign or malignant.
The word neoplasm literally means a new growth, from the Greek neo-, new + plasma, that which is formed, or a growth = a new growth.
Well, the hypoparathyroid explains the osteoperosis. Wonder how long this has been going on?
Sorry, I don't understand all the stuff about the gland sizes and the explanations. Someone will be along by tomorrow to help you out on that if not tonight, I'm sure.
Will be checking back to see what they told you. Hope it's nothing too bad. =^)