case_images: PMC11340817_01
case_images: Thoracic CT scan demonstrating a thymic mass.
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case_images: PMC11340817_01_autopsy-14-e2024506-g01.jpg
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case_images: Follow-up imaging showed a stable mediastinal mass measuring 4.6 x 2.6 cm (Figure 1).
case_images: Photomicrographs of the surgical specimen. - Wholemount image showing the heterotopic thyroid tissue and surrounding unremarkable thymic tissue (H&E 5x).
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case_images: PMC11340817_01_autopsy-14-e2024506-g02.jpg
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case_images: Sectioning revealed a 5.6 x 4.7 x 2.2 cm tan-brown, focally cystic, lobulated, and well-circumscribed mass within the left half of the thymus (Figure 2). The surrounding thymic tissue was compressed but was otherwise unremarkable (Figure 2).
case_images: Medium (A) and high (B) power photomicrographs showing the cytologic details of the thyroid tissue (H&E 100x and 400x, respectively).
case_images: autopsy-14-e2024506-g03.jpg
case_images: PMC11340817_01_autopsy-14-e2024506-g03.jpg
case_images: gf03
case_images: Microscopically, the sections from the mass showed benign thyroid tissue, composed of variable-sized thyroid follicles lined by a monolayer of cuboidal to columnar follicular epithelial cells and filled with eosinophilic colloid (Figure 3A and 3B).