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case_images: Axial images of plain CT-scan (A), contrast-enhanced CT-scan (B) in the first case. Axial CT images showing poorly defined irregular soft tissue mass (arrow) from the anterior to the middle mediastinum. The mass exhibits homogeneous enhancement (arrow in B). Left pleural effusion is observed.
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case_images: Additionally, the CT scan confirmed the presence of left pleural effusion and atelectasis (Fig. 1).
case_images: FDG PET-CT scan in the first case. FDG PET-CT scan showing strong uptake (SUV max = 9-12) in the mediastinal mass (arrow in A) along with nodular and linear uptake along the left chest wall (arrow in B). Multiple nodular uptake above the left clavicle (SUV max = 4-6) (arrow in C). Arrow head in C shows a benign thyroid tumor.
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case_images: Additionally, multiple nodular uptakes were noted in the para-aortic region and above the left clavicle (SUVmax = 4-6) (Fig. 2).
case_images: Strongly magnified pathology image of the hematoxylin-eosin staining of the tissue obtained by CT-guided biopsy in the first case. Densely proliferating atypical cells with a high N/C ratio.
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case_images: Pathological examination showed densely proliferating atypical cells with a high nuclear-cytoplasmic ratio (N/C ratio) (Fig. 3).
case_images: Axial images of contrast-enhanced CT-scan at 3 months after starting treatment in the first case. Axial CT scan image showing shrinkage of the mediastinal mass.
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case_images: Axial images of plain CT scan(A), contrast-enhanced CT scan(B) in the second case. Axial CT scan images showing a poorly defined soft tissue mass in the mediastinum causing left bronchus narrowing. The mass presents homogenous contrast enhancement.
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case_images: The mass was compressing the trachea and left bronchus, and showing homogeneous contrast enhancement (Fig. 5).
case_images: Coronal CT scan of paranasal sinuses in the second case. Coronal CT scan image showing soft tissue lesion in the left maxillary sinus, with thinning and discontinuity of the outer bone wall at the base of the maxillary sinus (arrow).
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case_images: Additionally, a soft tissue lesion with thinning and discontinuity of the outer bone wall at its base was observed in the left maxillary sinus (Fig. 6).
case_images: Axial MRI of T1WI(A), T2WI(B), T1WI after injection of Gadolinium (C) in the second case. Axial MRI shows a mediastinum mass with an iso signal on T1-weighted images(A) and a slightly high signal on T2-weighted images(B). Contrast-enhanced MRI showing homogeneous enhancement(C).
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case_images: Contrast-enhanced MRI showed homogeneous enhancement of the mass (Fig. 7).
case_images: FDG PET-CT scan of chest(A), paranasal sinuses(B) in the second case. FDG PET-CT scan showing abnormal uptake in the mediastinum and right axillary lymph nodes (SUVmax = 2.0-7.5) (A) and in the left maxillary sinus (SUVmax = 8.0)(B).
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case_images: Additionally, abnormal uptake was observed in the left maxillary sinus (SUVmax = 8.0) (Fig. 8).