Figure 4

Pathological characteristics. (a) An isolated solid nodule tumor with light-tan or grayish cut surface. (b) Tumor-harboring cysts containing yellowish-white fluid; (c) solid structures; (d) microcystic structures; (e) follicular and papillary cystic structures; (f) tubular structures. At high magnification, the tumor cells are round or oval with little atypia. They have eosinophilic granular or vacuolated cytoplasm with small, uniform nuclei (green box).