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I read in Tortora and Derrickson that goitre is associated with euthyrodism.

How is that possible?

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I don't know the answer, but here is a fairly recent and highly-cited review that may be a good place to start: Krohn et al. (2005) Molecular pathogenesis of euthyroid and toxic multinodular goiter. Endocrine Reviews 26: 504-524 – Alan Boyd Oct 22 '13 at 18:09
up vote 4 down vote accepted

In this context, euthyroidism refers to the amount of hormone present.

What is a goiter:

The term “goiter” simply refers to the abnormal enlargement of the thyroid gland. It is important to know that the presence of a goiter does not necessarily mean that the thyroid gland is malfunctioning. A goiter can occur in a gland that is producing too much hormone (hyperthyroidism), too little hormone (hypothyroidism), or the correct amount of hormone (euthyroidism). A goiter indicates there is a condition present which is causing the thyroid to grow abnormally.

See also here and here for more of the same info.

ETA: According to this:

Chronic lymphocytic thyroiditis (CLT), also known as Hashimoto thyroiditis, is an autoimmune, inflammatory process that causes up to 55% to 65% of all euthyroid goitres...

Although, as the link I already gave above state, regular ol' iodine deficiency can still cause euthyroid goiter.

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What condition can cause an increase in size of thyroid gland but still produce normal amount of thyroxine ? (I specifically want to know this.) – biogirl Oct 22 '13 at 17:50

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