Rare solitary splenic metastasis from a thymic carcinoma detected on fluorodeoxyglucose-positron emission tomography: A case report

Figure 1 Computed tomography revealed mass over mediastinum and spleen. A and C: The mediastinum has a confluent and lobulated soft tissue mass (arrow), encasing the right brachiocephalic artery, right and left carotid arteries, and left subclavian artery and compressing the superior vena cava; B and D: There is one cystic mass (arrow), measuring approximately 5.1-cm in diameter, in the spleen.

Figure 2 Fluorine-18 fluorodeoxyglucose positron emission tomography/computed tomography revealed increased fluorodeoxyglucose uptake over superior mediastinum and spleen. A and C: Intense fluorodeoxyglucose (FDG) avidity in a soft tissue lobulated mass occupying the superior mediastinum (SUVmax = 16.0, size > 9.0 cm); B and D: Intense FDG avidity over the cystic lesion in the spleen (SUVmax = 9.2, size = 6.1 cm).

Figure 3 Pathology images. A: Hematoxylin-Eosin staining of the thymic mass showed polygonal and spindle shaped tumor cells accompanied by giant cells with bizarre and multilobulated nuclei; B: Hematoxylin-Eosin staining of the spleen tissue was compatible with poorly differentiated metastatic carcinoma.