PMC6243414_01
(A) Injected thoracic CT-scan shows an enhanced tissular mass of the posterior and superior mediastinum (arrow). (B) Hyperfixation of the lesion seen on the technetium (99mTc) sestamibi scan (arrow).
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A thoracic computed tomography (CT) with contrast injection revealed a 3.8 cm enhanced retrotracheal lesion located in the posterior mediastinum (Figure 1A). It revealed a significant hyperfixation by the lesion initially discovered on CT-scan, suggesting an ectopic parathyroid adenoma of the posterior mediastinum (Figure 1B).
(A) The resected specimen showing a well-encapsulated solid mass. (B) The histological view showing a solid nested architecture with benign-looking cells arranged in a delicate vascular and hemorrhagic stroma (mainly parathyroid chief cells) (H&E x50).
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Surgical exploration after incision of the mediastinal pleura by thoracotomy found a well-encapsulated mass of the posterior and superior mediastinum behind the trachea (Figure 2A). The histopathological examination of the resected specimen disclosed the diagnosis of a parathyroid adenoma (Figure 2B).