PMC7509348_01
Findings of chest and abdominal CT.. (a) Chest CT image shows anterior mediastinal tumor (38 x 24 mm; arrow). (b) Abdominal CT image shows wall thickness in rectum (arrow).
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The CT revealed a 38 x 24 mm anterior mediastinal tumor which was enhanced at the equilibrium phase and in contact with the ascending aorta (Fig. 1a), which was suspected to be malignant. At the same time, wall thickness of rectosigmoid colon with a major axis of 5 cm and peritoneal lymphadenopathy were also identified coincidentally by the CT (Fig. 1b), suggesting a rectal cancer.
Findings of MRI.. T1- (a) and T2- (b) weighted images show anterior mediastinal tumor (38 x 30 mm; arrows) in wide contact with ascending aorta to right atrial appendage.
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Magnetic resonance imaging (MRI) showed a 38 x 30 mm mass (Fig. 2a) that was attached from the ascending aorta to the right atrial appendage (Fig. 2b), but infiltration was not apparent.
Colonoscopy findings.. Results show type II rectal tumor.
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Colonoscopy and barium enema revealed a Borrmann type 2 tumor (Fig. 3) in the rectosigmoid colon with a major axis of 5 cm and a distant 18 cm from anal verge.
Histological findings.. Tumor comprises round- to oval-shaped cells with prominent peripheral palisading appearance (H & E stain; magnification, x100).
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Histopathologically, the tumor comprised round- to oval-shaped cells with a prominent peripheral palisading appearance (Fig. 4).