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Pulpotomy of a deciduous tooth is a standard procedure done in paediatric patients. Quite a few times it can give rise to side effects, one of the side effects being cyst formation in the periradicular area of pulpotomised tooth. Diagnosis of this cyst is difficult, as classifying them under radicular cyst or dentigerous cyst is reported dilemma in literature. This paper discusses the differential diagnosis of such periradicular cyst, the probable theory of pathophysiology of the infected dentigerous cyst, and treatment by marsupialization technique. The successful eruption of a horizontally impacted involved tooth was noted, with the alignment of the arch and healthy bone formation after treatment.