A case of solid pseudopapillary tumor of the pancreas

Figure 1 A hypoechogenic well-marginated solid mass is seen at the pancreatic head region (arrows). Vena cava inferior is slightly compressed by the mass. SV: Splenic vein; P: Pancreatic tail.

Figure 2 Axial precontrast CT image shows that the mass is hypodense with no evidence of calcification. The density of the mass is measured 38.19 HU.

Figure 3 Precontast T1-weighted axial MR image shows that the mass is predominantly hypointense and the hyperintense focus represents hemorrhage (arrow).

Figure 4 T2-weighted axial MR image shows that the mass is predominantly hyperintense mostly composing of solid compounds and minimal cystic areas.

Figure 5 A: Arterial-phase contrast-enhanced T1-weighted image shows minimal peripheral thin contrast enhancement (arrow); B, C: Portal venous and equilibrium-phase contrast-enhanced T1-weighted images show that the mass enhances diffusely slightly.

Figure 6 A: Pancreatic tissue is seen around the tumor including papillary structures and hemorrhagic areas (HE × 40); B: Solid pseudopapillary tumor. Pseudopapillary aggregates lined by tumor cells with uniform nucleus and narrow eosinophilic cytoplasms are visible (HE × 40); C: Micrograph shows progesterone receptor positivity in the nucleus of tumor cells (× 100).