Sequence of events: # Iodine deficiency leading to decreased T4 production. # Induction of thyroid cell hyperplasia due to low levels of T4. This accounts for the<unk><unk>  appearance. # Increased replication predisposes to a risk of mutation in the TSH receptor. # If the mutated TSH receptor is constitutively active, it would then become<unk> ' and produces excess T3/T4 leading to hyperthyroidism.
Toxic multinodular goitre
Nontoxic nodular goiter
Radiation-induced thyroiditis
Thyroid adenoma
Endemic goitre
Subacute lymphocytic thyroiditis
Follicular thyroid cancer
Acute infectious thyroiditis