Figure 1

(a and b) Adenoid cystic carcinoma showing cribriform growth pattern and tumor cell nests. (c and d) Polymorphous low-grade adenocarcinoma showing tumor infiltration into fat and perineural space, (c) and cribriform architecture (d). (e) Solid-type adenoid cystic carcinoma with mitoses and central necrosis. (f) Polymorphous low grade adenocarcinoma showing a tubule lined by a single layer of cuboid, monomorphic tumor cells with round, vesicular nuclei containing indistinct nucleoli (same case as in d).