Conclusion :
Even though lateral sinus floor elevation is a well-documented procedure, its complexity is greatly influenced by anatomical and patient-related factors. A thorough clinical examination completed with a radiographic assessment with CBCT or CT reconstructions is mandatory before the intervention. To our knowledge, this is the first published case of a sinus graft in presence of a lateral wall osteoma. The management of such obstacles is decided on a case-by-case basis after evaluation of the benefit/risk ratio.