Differential Diagnoses for Nontoxic Goiter

Primary Differential Categories

The American College of Surgeons and the National Comprehensive Cancer Network recommend considering multinodular goiter, simple diffuse goiter, Hashimoto's thyroiditis, colloid goiter, hyperplastic/adenomatoid nodules, follicular neoplasms, and well-differentiated thyroid carcinoma in the differential diagnosis for nontoxic goiter 1, 2
The National Comprehensive Cancer Network suggests that multinodular nontoxic goiter is the most frequent presentation in clinical practice, particularly in women in their fifth and sixth decades, and is associated with iodine deficiency, iron deficiency, selenium deficiency, female sex, and advancing age 3
The American Thyroid Association recommends classifying Hashimoto's thyroiditis as benign on FNA cytology, which may present with diffuse or nodular enlargement, and is diagnosed primarily through clinical presentation and thyroid function tests 1

The National Comprehensive Cancer Network states that follicular or Hürthle cell neoplasm cannot be definitively classified as benign or malignant on FNA alone and requires surgical excision for definitive diagnosis 1
The American College of Radiology recommends using ultrasound to identify suspicious nodules requiring biopsy, even in the setting of goiter, as papillary or follicular carcinoma may present within a goiter 1, 2
The National Comprehensive Cancer Network notes that anaplastic thyroid carcinoma presents with rapidly enlarging neck mass, dyspnea, dysphagia, neck pain, or hoarseness, and requires core or surgical biopsy if FNA is suspicious or non-definitive 1

The American Association of Clinical Endocrinologists recommends measuring serum TSH first to guide the diagnostic pathway, and if TSH is normal, proceeding with thyroid ultrasound as first-line imaging 2
The National Comprehensive Cancer Network suggests that radionuclide uptake scan is not indicated in euthyroid patients with goiter unless evaluating for substernal extension, and CT imaging is superior to ultrasound for evaluating substernal extension and tracheal compression when obstructive symptoms are present 2, 4

The American College of Surgeons recommends using ultrasound to confirm thyroid origin and characterize morphology in patients with compressive symptoms, and CT scan is preferred over MRI to evaluate substernal extension and degree of tracheal compression 2, 4
The National Comprehensive Cancer Network states that rapid growth increases suspicion for malignancy, particularly anaplastic transformation, and core or surgical biopsy may be needed if FNA is non-diagnostic 1