The development of cognitive dysfunction can profoundly affect HR-QoL as well as the possibility of societal participation and ability to work, and thereby relevantly impacts prospects for cancer survivorship. The aim of the study is to obtain improved understanding of the scope and magnitude of objective cognitive dysfunction in DTC survivors, and its relation to subjective cognitive dysfunction, thyroid hormone levels, physical activity and HRQoL. This is done in a prospective study where patients operated for a thyroid nodule (Bethesda IV-VI, i.e., benign \[goitre with nodule and fibroadenomas\], low-risk DTC and intermediate-high risk DTC) are included and asked to serially perform online neuropsychological testing as well as to complete questionnaires related to HR-QoL, physical activity and additional psychological and physical complaints. Blood is analysed for levels of thyroid hormones and systemic inflammation.
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Inclusion Criteria: * Age \>18 years old, indication for surgery because of a thyroid nodule Bethesda IV-VI * Able to read and understand the Swedish language * Access to desktop computer or laptop with internet connection * Able and willing to provide written informed consent Exclusion Criteria: * A previous diagnosis of (auto-immune) hypothyroidism * A previous cancer diagnosis (excluding basal cell cancer of the skin) * Indications for surgery other than (solely) a thyroid nodule (i.e., concomitant Graves) * A diagnosis of medullary and anaplastic thyroid cancer