Hemangiomas are one of the common neoplastic lesions seen in the oral and maxillofacial areas of children. However, since the clinical course and findings vary and differ from those seen in adult patients, testing and diagnosis become difficult. Here,we report the case of a 3-year-old child with a history of trauma to the deciduous teeth. The child was diagnosed with Masson's intravascular hemangioma (MIH) over the course of observation without a definitive diagnosis, despite exhibiting abnormal hemangiomatous findings.

The patient was brought to our department with the primary complaint of crown discoloration after trauma to the maxillary anterior deciduous teeth and gingival swelling in the left maxillary deciduous molar region. The deciduous teeth around the gingival swelling area were sound based on the radiographs taken; however, the cause was unknown. Despite follow-up, the patient had the problematic tooth extracted during an outpatient visit due to enlargement of the swollen area and for esthetic reasons. The patient was finally diagnosed with MIH following a histopathological examination. The patient followed a favorable clinical course after tumor extraction and has shown no signs of recurrence to date. We identified vital reactions in the dental pulp for the deciduous tooth adjacent to the area of gingival swelling and restored both the functional and esthetic aspects of the tooth.

For children in the growth and development phase, it is necessary to consider the frequency of radiological examinations and the effects on the pediatric patient when choosing the timing of intervention. Going forward, we plan to monitor the patient to check for neoplastic recurrence until the completion of permanent tooth eruption.