PMC7548402_01
Axial (a) and coronal (b) contrast-enhanced CT images show a poorly enhancing mass in segment 7 of the liver. (c) Fat suppressed T2-weighted MR image shows slightly hyperintense mass in segment 7 of the liver.
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Abdominal contrast-enhanced CT showed a mass 2.4 cm in size with slight enhancement in segment 7 of the liver (Fig. 1). Abdominal magnetic resonance imaging (MRI) showed hyperintense mass on diffusion-weighted imaging and a slightly hyperintense mass on fat-suppressed T2WI in segment 7 of the liver (Fig. 1).
(a) The tumor in the S7 segment of the liver 2 years before resection (10 mm in diameter). (b) The tumor one year before liver resection (17 mm). (c) The tumor just before resection (24 mm).
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On re-evaluating the CT images taken at our institute in the past, we found that the lesions were not visible on the CT scan 4 years ago, but were slightly visible on the CT scans performed 2 years ago, and had gradually increased in size (Fig. 2).
Macroscopic appearance of the resected specimen of the liver. The tumor is 25 x 25 x 20 mm in size.
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The tumor was located in segment 7 of the liver, and partial resection of segment 7 of the liver was performed (Fig. 3).
Microscopic findings. (a) HE stain (x200) of the tumor in the liver. (b) c-kit stain (x200). (c) HE stain (x200) of the tumor of small intestine 32 years ago. (d) c-kit stain (x200) of the tumor of the small intestine 32 years ago.
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Immunohistochemical staining revealed CK7 (-), CK 20 (-), CAM 5.2 (-), Alpha-SMA (-), Vimentin (+), CD 34 (-), C-kit (+), Desmin (-) (Fig. 4).