Conjunctival chemosis: an uncommon complication after transcrestal lifting of the sinus floor

Conjunctival chemosis is non-specific oedema, which may be caused by many systemic and local factors, including allergies; bacterial, viral, and mycotic infections; autoimmune diseases; thyroid disorders; and neoplasms. The orbit is susceptible to the contiguous spread of infections from the maxillary sinus as they are separated only by a thin plate of bone, which could also have congenital bony dehiscences