Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 8 4 2011 12 15 213 217 L. Toomarian Associate Professor, Department of Pediatric Dentistry, Shahid Beheshti University of Medical Scienc M. Moshref Associate Professor, Department of Oral and Maxillofacial Pathology, Shahid Beheshti University of M M. Mirkarimi Assistant Professor, Department of Pediatric Dentistry, Zahedan University of Medical Sciences, Zahe A. Lotfi Assistant Professor, Department of Oral and Maxillofacial Pathology, Shahid Beheshti University of M M. Beheshti Pedodontist, Private practice 2015 10 03 Radicular cysts arising from deciduous teeth are rare. This report presents a case of radicular cyst associated with a primary molar following pulp therapy and discusses the relationship between pulp therapy and the rapid growth of the cyst. The treatment consisted of enucleation of the cyst sac and extraction of the involved primary teeth and 20 months follow up of the patient. Early diagnosis of the lesion would have lead to a less aggressive treatment plan. https://fid.tums.ac.ir/index.php/fid/article/view/265 https://fid.tums.ac.ir/index.php/fid/article/download/265/265