Table 1. Histological Diagnoses of 99 Thyroid Incidentalomas.

Lesion Type and Diagnosis	No. of Lesions*
Malignant	64 (64.6%)
Papillary adenocarcinoma	38
Medullary carcinoma	8
Thyroid follicular adenocarcinoma	10
Anaplastic thyroid carcinoma	7
Metastatic carcinoma	1
Benign	35 (35.4%)
Thyroid adenoma	29
Colloid retention cyst	1
Nodular hyperplasia	1
Nodular goiter	2
Hashimoto's thyroiditis	2

^*Data in parentheses are percentages.