A rare, low-grade primary intraosseous carcinoma of the jaws, with bland cytology, markedly sclerotic stroma, and aggressive infiltration. It is characterized by single-file thin cords, nests, and strands of epithelium in a densely sclerotic stroma. Cytologically, individual epithelial cells are bland, with infrequent mitoses. Their cytoplasm may show vacuolation or partial clearing. There is no squamous differentiation. Despite the benign appearance, there is invasion of skeletal muscle, and perineural infiltration is characteristic. (WHO 2017) [from
NCI]