PMC7311667_01
Unenhanced CT showed the mass to be isoattenuating and barely perceptible. (A) It demonstrated mild enhancement in the arterial phase (B) and moderate heterogeneous enhancement in the portal (C) and the late phases (D). The corresponding CT values were measured (insert). There was no evidence of superior mesenteric artery or portal venous invasion.
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F1
The results of axial unenhanced CT showed the mass to be isoattenuating and barely perceptible (Figure 1A). It demonstrated mild enhancement in the arterial phase (Figure 1B) and moderate heterogeneous enhancement in the portal (Figure 1C) and the late phases (Figure 1D).
The lesion was identified in T2-weighted images (C), diffusion-weighted images (D), and magnetic resonance cholangiopancreatography (F). There was no significant difference between the in-phase (A) and the out-of-phase MRI imaging (B). Coronal MRI imaging (E).
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F2
T2-weighted images (T2WI) (Figure 2C), and slightly hyperintense on diffusion-weighted images (DWI) (Figure 2D). There was no significant difference between the in-phase (Figure 2A) and the out-of-phase MRI (Figure 2B) and no signs of necrosis, hemorrhage, or cyst formation. The coronal MRI image also showed the mass in the pancreatic tail (Figure 2E). The magnetic resonance cholangiopancreatography (MRCP) images showed no expansion of the pancreatic duct, extrahepatic bile duct, or intrahepatic duct (Figure 2F).
Post-contrast MRI. T1WI without contrast enhancement (A), the arterial phase (B), the portal (C), and the late phases (D).
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F3
After contrast agent (Gd-DTPA) administration (Figures 3B-D), the dynamic enhancement pattern was similar to that of CECT.
H&E stains (A,B), original magnifications x100 and x200, respectively. The diagram shows the dynamic enhancement patterns of the common tumors of the pancreas (C).
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F4
Upon histological staining, it was revealed that the fibroblastic epithelioid cells were ovoid and arranged in nests (Figure 4A), cords, or sheets (Figure 4B) within a collagen-rich extracellular matrix.