Giant concha bullosa containing another concha bullosa inside: unique anatomic variation of the middle turbinate.

Detailed knowledge of the anatomical variations of the lateral nasal wall is crucial for both the surgeon who is performing endoscopic sinus surgery and the radiologist who is involved in the preoperative work-up. Preoperative recognition of these variations will avoid possible complications during the surgery. In this report, we present a unique anatomical variant of the middle turbinate, a large concha bullosa inside a giant concha bullosa, which has never been reported before. Furthermore, we comment on the differential diagnosis of the variations of the middle turbinate and on the embryology of the nasal turbinates. This report also supplies additional aspects to rhinologists in the scope of middle turbinate pneumatization.