The author experienced recently in a 14 years old school boy whom was diagnosed clinically and histopathologically as Follicular Cyst of the Maxillary Sinus. There were one first premola tooth and one deformed tooth in the cavity of the Cyst and a root of left upper canine tooth between walls of the Cyst and Maxillary Bone. The Cyst was successfully removed and postoperative course was satisfactory. The author is reporting the Case and Reviews of Literature on this subjects.