Pancreatic pseudocyst filled with semisolid lipids mimicking solid mass on endoscopic ultrasound

Figure 1 Image of the cystic lesion by contrast-enhanced abdominal computed tomography (arrow). There was a 17-mm well-marginated, round, low-density lesion in the body of the pancreas. The central contents of the lesion showed no enhancement in the post-contrast-enhanced image.

Figure 2 Image of the cystic lesion on EUS. It showed a 17-mm × 19-mm, well-circumscribed, round, homogenous, hypoechoic solid lesion with central echogenicity (arrows).

Figure 3 Gross finding of the pancreatic cystic lesion. There was a 17-mm, unilocular, well-encapsulated cystic lesion filled with yellowish muddy material in the body of the pancreas.

Figure 4 Microscopic finding of the pancreatic pseudocyst. A: Microscopic finding of the pancreatic pseudocyst. HE staining showed multiple lipid droplets and cholesterol clefts; B: Sudan black B stain showed positive findings for lipid droplets, stained with a dark brown color.