case_images: PMC8437819_01
case_images: Chest computerized tomography findings. A The nodule is located at the side of the left lower lobe or posterior mediastinum. B The nodule showed no contrast effect.
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case_images: Chest computed tomography (CT) revealed a nodule on the side of the left lower lobe or posterior mediastinum (Fig. 1A). It showed no contrast effect (Fig. 1B).
case_images: 18F-fluorodexyglycose positron emission tomography/computerized tomography revealed uptake (the maximum standardized uptake value = 1.66) in the lesion.
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case_images: Furthermore, 18F-fluorodexyglucose positron emission tomography/CT (FDG-PET/CT) revealed a little uptake (the maximum standardized uptake value = 1.66) in the lesion (Fig. 2).
case_images: Intraoperative picture of the lesion. The white pleural change located at the left lower lobe (arrow).
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case_images: This pleural change was considered as the nodule that was visualized in the image, and a partial resection was performed (Fig. 3).
case_images: A, B Specimen findings. A part of the white pleural change had gross pleural thickening and cyst-like features located directly below the pleural change. C Hematoxylin and eosin staining of the nodule. The area of the grayish-white capsule had a cyst-like features that was responsible for the hyalinization of connective tissue (magnification x 40). D The inside of the cyst was composed of red cells, fibrin, and hemosiderin-laden macrophage (magnification x 100). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
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case_images: Considering this, it was our understanding that the nodule was a collection of blood (Fig. 4).