Cemento-Osseous dysplasia(COD) is a condition where normal bone is replaced by fibrous connective tissue and cementum-like deposits. Implant rehabilitation of a posterior mandibular edentulism in presence of a COD can be a challenging situation due to the lack of vascularization and the high risk of infection of such lesions.

Maxillary sinus grafting is a well-know procedure with high predictability used to to correct vertical bone defects in the posterior region of the maxilla.The presence of a sinus osteoma adds to its difficulty and may recquire a more specific case management depending on the lesion's extent.