Bony ossicle in the maxillary sinus containing a tooth

Ectopic third molar in condylar region

“…Other locations for ectopic third molars are the maxillary sinus and the infratemporal fossa. 4 Here two clinical cases of an ectopic third molar in the condyle region associated with a cyst and the proposed protocol for extraction are presented.…”

Ectopic Tooth in the Anterior Wall of Maxillary Sinus

“…4 Although ectopic, impacted teeth found in the maxillary sinus are usually normal in shape; a few cases involving malformed teeth have been reported. 4 In such cases, dentigerous cysts in the maxillary sinus may be discovered on radiographic examination. Foreign bodies, metallic or nonmetallic, may also lay dormant in the maxillary sinus.…”

Heterotopic Ossification in the Maxillary Sinus

“…Maxillary sinus could be involved by calcifications, ossifications and residual bone. 1 Heterotopic ossification (HO) refers to the formation of mature lamellar bone in nonosseous tissues. HO most commonly occurs as a complication of total hip arthroplasty, acetabular or elbow fractures requiring surgical treatment, traumatic brain or spinal cord injuries, severe burns, in breast implant capsules, or genetic disorders.…”