A case of intrathoracic goiter composed of two tumors

: A 70-year-old female was referred to our hospital because of swelling at her frontal neck and an abnormal shadow on a chest X-ray film. CT scan and MRI showed a 11.0 x 7.5 cm well-demarcated tumor in the upper mediastinum. Thyroidal scintigraphy revealed an slight accumulation, leading to a diagnosis of intrathoracic goiter. During operation the mass was found to be composed of two tumors. The upper tumor was attached with fibrous adhesion to the right lobe of cervical thyroid but no connection. Histological examination showed follicular but not malignant adenoma of the thyroid.