Rare Anatomic Variation: Pneumatized Secondary Middle Turbinate

Area of Science:

• Otolaryngology
• Anatomy
• Radiology

Background:

• Nasal turbinates exhibit morphological variations, including concha bullosa and secondary middle turbinate (SMT).
• Pneumatized SMTs are exceptionally rare, with only two prior documented cases in Computed Tomography (CT) studies.

Observation:

• A 44-year-old male patient presented with bilateral SMTs and pneumatized superior turbinates, identified during Cone Beam CT (CBCT) for dental procedures.
• The left SMT was unpneumatized and medially projecting, while the right SMT was pneumatized and infero-medially projecting.
• The right pneumatized SMT communicated with the ethmoidal bulla, with an ethmoidal infundibulum beneath, potentially impacting the ostiomeatal unit.

Findings:

• This case represents the third documented instance of pneumatized SMTs.
• The patient exhibited bilateral SMTs, with one being pneumatized, alongside pneumatized superior turbinates.
• Detailed anatomical relationships between the SMT, ethmoidal bulla, and ethmoidal infundibulum were observed.

Implications:

• Such rare anatomical variations can potentially obstruct the normal drainage pathways of the ostiomeatal unit.
• Accurate documentation via CT or CBCT is crucial to avoid inadvertent surgical corridors during procedures.
• Highlights the importance of advanced imaging in identifying subtle anatomical anomalies in the sinonasal region.