A dentigerous cyst or follicular cyst is a form of odontogenic cyst. The cyst is associated with the crown of the impacted or unerupted teeth. It usually remains completely asymptomatic unless when infected and can be discovered only on routine radiographic examination. However, when infected it may turn painful, grow in size and result in a palpable mass. Additionally, as they grow they displace adjacent teeth and result in severe bone destruction. Although, hyperplastic follicular tissue and dentigerous cyst are the two most common entities associated with the crown of an impacted tooth, other diagnostic possibilities, including odontogenic tumors should also be considered in case of a pericoronal radiolucency. This article presents a case of an infected dentigerous cyst which mimicked other cysts and tumors and was quite a challenge in terms of an accurate diagnosis, yet despite timely interventions had horrendous consequences in terms of prognosis
