Central pancreatectomy for pancreatic schwannoma: A case report and literature review

Figure 1 Ultrasound findings. A: Ultrasound revealed a 1.4 cm × 1.3 cm, well-defined cystic lesion (arrow) in the pancreatic body; B: A 6.8 cm sized strong echo (arrow) was shown in the gallbladder.

Figure 2 Computed tomography findings. A: An unenhanced CT scan showed a 1.6 cm × 1.1 cm well-defined hypodense mass (arrow) in the pancreatic body; B: On the contrast-enhanced CT, the mass (arrow) was not enhanced. CT: Computed tomography.

Figure 3 Magnetic resonance imaging findings. A: The mass in the pancreatic body (red arrow) and gallbladder (green arrow) appeared hypointense on T1 weighted images; B: The mass in the pancreatic body (red arrow) appeared inhomogeneously hyperintense and the enlarged gallbladder (green arrow) appeared hyperintense on T2 weighted images.

Figure 4 Microscopic examination. A: A thin capsule (black arrow) was found between the tumor (red arrow) and pancreatic (green arrow) tissues (HE, 40 ×). B: The tumor was mainly composed of spindle-shaped cells with palisading arrangement and no atypia, which is consistent with a benign schwannoma. Both hypercellular and hypocellular areas were visible (HE, 200 ×). HE: Hematoxylin and eosin.

Figure 5 Immunohistochemical staining. The tumor revealed strongly positive staining for S-100 (HE, 200 ×). HE: Hematoxylin and eosin.