Radicular cysts are one of the most common odontogenic cyst of the jaws. However, those

arising from primary teeth are rare.Purpose of this report is to present a case of a child with a radicular cyst mimicking an inflammatory dentigerous cyst. A 6–year–old boy reported to the Department of Pedodontics with the chief complaint of pain and swelling on the lower right primary molar tooth region.The clinical and radiological features of the present case gave an impression that it was a dentigerous  cyst; however it’s histopathological features proved it was a radicular cyst.Considering the age,size of lesion and involvement of unerupted premolar marsupialization was preferred as a conservative treatment of choice. The success of the treatment was evident both clinically and radiographically during the follow–up period.In the case of a child,it is equally important to understand the possible sequelae and plan appropriate intervention in a timely and effective manner.