Most aggressive type of cyst Which causes hollowing of mandible:

Dentigerous cyst is potentially capable of becoming an aggressive lesion, with considerable bone expansion, facial asymmetry, hollowing out of the entire ramus upto the coronoid process or condyle. Moreover the epithelium of the dentigerous cysts is pluripotential, and can give rise to ametobtastoma, epidermoid carcinoma or the rnucoepidermoid carcinoma.  while OKC has tendency to grow along the internal aspect of jaw causing minimal expansion.