Figure 7.

Microscopic examination of the tumor in patient 2. (A) The tumor cells are separated by mesenchymal tissues into patches with a morphology of ‘dried follicles’ (×100). (B) The tumor cells show a morphology mimicking thyroid follicles or a sieve with red-stained colloid-like material in the lumen (×100). (C) The colloid-like material broke and a number of the lumens and merged. The tumor was covered with a thin fibrous pseudo-capsule (×200). (D) The nuclei are mostly eosinophilic, enlarged and overlapped in round, oval or spindle shapes with fine chromatin pattern and one to two inconspicuous nucleoli per nucleus (×400). Hematoylin and eosin staining.