case_images: PMC10904678_01
case_images: PMC10904678_02
case_images: US findings. (a) On US, a low echoic mass was pointed out in segment 3 of the liver (red dotted area). (b) Blood flow signal was observed around the mass (white arrow).
case_images: CRIS2024-9863411.001.jpg
case_images: PMC10904678_02_CRIS2024-9863411.001.jpg
case_images: fig1
case_images: A low echoic mass (12.8 x 12.0 mm) with blood flow signal was detected in segment 3 of the liver on abdominal US (Figure 1).
case_images: CT findings. (a) On plain CT, the mass was detected as low-density lesion. (b) The mass was not enhanced on contrast-enhanced CT in arterial phase. (c) The mass was slightly enhanced in portal phase. (d) The mass was detected as low-density lesion in delayed phase (yellow-dotted area).
case_images: CRIS2024-9863411.002.jpg
case_images: PMC10904678_02_CRIS2024-9863411.002.jpg
case_images: fig2
case_images: The mass was not enhanced on contrast-enhanced CT in the arterial phase, was slightly enhanced in the portal phase, and was detected as low-density lesion in the delayed phase (Figures 2(a)-2(d)).
case_images: MRI findings. (a) The mass was visualized as low signal in T1WI. (b) The mass was visualized as high signal in T2WI. (c) On diffusion-weighted image, the mass was shown as high signal intensity. (d) On gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced MRI, the mass was shown as low signal intensity in hepatobiliary phase (yellow-dotted area).
case_images: CRIS2024-9863411.003.jpg
case_images: PMC10904678_02_CRIS2024-9863411.003.jpg
case_images: fig3
case_images: It was shown as an area of low signal intensity in the hepatobiliary phase on gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid-enhanced MRI (Figures 3(a)-3(d)).
case_images: Intraoperative findings. (a) A discolored area was observed in the right lobe of the liver (yellow-dotted area), and it suggested chronic inflammation. (b) An area of the tone was also observed in left lobe, and a mass was observed in the area (yellow-dotted area). (c) Laparoscopic partial hepatectomy was performed.
case_images: CRIS2024-9863411.004.jpg
case_images: PMC10904678_02_CRIS2024-9863411.004.jpg
case_images: fig4
case_images: The mass was recognized at segment 3 in the discolored area (Figures 4(a)-4(c)).
case_images: The resected specimen was a hard, elastic, well-demarcated whitish mass.
case_images: CRIS2024-9863411.005.jpg
case_images: PMC10904678_02_CRIS2024-9863411.005.jpg
case_images: fig5
case_images: The resected specimen was an elastic, hard, well-demarcated whitish mass measuring 12 x 10 mm (Figure 5).
case_images: Histopathological findings. (a) HE low magnification. A geographical hyalinization was observed in the center of the lesion. (b) HE high magnification. It was a lesion showing confluent proliferation of lymphoid follicles with germinal center (yellow-dotted area). (c) Lymphoid follicles were CD20-positive. (d) Lymphoid follicles were Bcl-2-negative. (e) Mild IgG-positive histiocytes and plasma cells were observed between the follicles (yellow-dotted area). (f) There was no significant increase in IgG4-positive cells.
case_images: CRIS2024-9863411.006.jpg
case_images: PMC10904678_02_CRIS2024-9863411.006.jpg
case_images: fig6
case_images: IgG-positive histiocytes and plasma cells were observed between the follicles, but there was no significant increase in IgG4-positive cells (Figures 6(a)-6(f)). Inflammatory findings in the background liver tissue were mild.