Basal Cell Adenoma
This high power view of a basal cell adenoma shows anastomosing basaloid cell nests with a jigsaw puzzle-like appearance. The nests contain eosinophilic basement membrane-like material and are surrounded by hypocellular stroma containing a few myoepithelial cells. This type of growth pattern may raise suspicion for adenoid cystic carcinoma. The presence of stromal myoepithelial cells serves as a clue. Stromal myoepithelial cells are absent in adenoid cystic carcinoma.