PMC6119205_01
(A) Transabdominal ultrasound revealing a solid-cystic mass at the pancreatic head. (B) Endoscopic ultrasound indicating a 29.9 x 32.7-mm nonhomogeneous hypoechoic solid-cystic mass detected at the pancreatic head. (C) Network structure and hypoechoic nodules.
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F1
Radial endoscopic ultrasound (EUS) showed a 29.9 x 32.7-mm nonhomogeneous hypoechoic mass with dilation of common biliary duct and tortuousness of main pancreatic duct (Figure 1). A network structure and hypoechoic nodules were observed at the inner cystic wall and edge, respectively (Figure 1).
Small, round or spindle-shaped cartilage cells and islets of differentiated cartilage (hematoxylin and eosin, x100).
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F2
Specimens from EUS-guided fine-needle aspiration revealed an apparent cartilage tissue, in which small round or spindle-shaped cartilage cells and islets of differentiated cartilage could be observed (Figure 2).