Maxillary Sinus Mucopyocele Mimicking a Radicular Cyst: A Case Report.

Maxillary sinus mucoceles are rare, benign, and expansile lesions that can lead to gradual enlargement and bony erosion. When a mucocele becomes infected, it is termed a mucopyocele or pyocele and can closely mimic odontogenic pathologies. We report the case of a 38-year-old male presenting with pain and swelling in the maxillary posterior region, mimicking a radicular cyst. Accurate diagnosis relies on a combination of symptoms, clinical evaluation, imaging, surgical exploration, and histological confirmation. This case highlights the clinical overlap between sinus mucopyoceles and odontogenic lesions, emphasizing the importance of a comprehensive diagnostic approach.