Magnetic resonance imaging in a case of anaplastic thyroid carcinoma showing an inhomogeneous mass of the right thyroid lobe with invasion of adjacent anatomic structures

Ultrasonography shows a 5 cm hypoechogenous nodule of the left thyroid lobe with calcifications. Final diagnosis was anaplastic thyroid carcinoma

Fluorine-18 fluorodeoxyglucose positron emission tomography/computed tomography (¹⁸F-FDG-PET/CT) in a patient with anaplastic thyroid carcinoma. ¹⁸F-FDG-PET shows an area of increased metabolism in the neck (a) corresponding to a large and inhomogeneous thyroid mass at co-registered CT (b), as even demonstrated by fused PET/CT images (c). The thyroid mass shows a central area of reduced metabolism due to necrosis and an external ring of increased metabolism as demonstrated by fused PET/CT images (d)

Fluorine-18 fluorodeoxyglucose positron emission tomography/computed tomography (¹⁸F-FDG-PET/CT) in a patient with anaplastic thyroid carcinoma and lymph nodal metastases. ¹⁸F-FDG-PET shows several areas of increased metabolism in the neck (a) corresponding to a large and inhomogeneous thyroid mass at contrast-enhanced CT (b). Fused PET/CT images (c1, c2) showed a large thyroid tumor with increased metabolism (yellow arrow) and several lymph nodal metastases (red arrows)

Ultrasonography (a1, a2) and computed tomography (b) findings in a patient with large B-cell lymphoma of the thyroid gland. Large hypoechogenous nodules with inhomogeneous echotexture involving both thyroid lobes are evident at ultrasonography (a1, a2). Contrast-enhanced computed tomography shows a large and inhomogeneous thyroid mass with compression of the near structures