Fig. 3

a The resected specimen was covered with a fibrous capsule and had a well-defined mass. The cut surface was a gray-white solid component, and small cysts were found in the periphery (indicated by an arrow). b The tumor was composed of relatively uniform cells with fine chromatin, which had round to oval nuclei arranged in solid, trabecular, or rosette-like growth patterns (× 100 magnification). c Cysts found in the periphery were lined with stratified squamous epithelium (× 400 magnification). d Multiple small cysts were found within the solid component and lined with columnar epithelium (× 400 magnification)