Arrested pneumatization of the sphenoid sinus: a benign condition that simulates pathological lesions

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Luis Barahona A.
Ignacio Cifuentes R.
Gonzalo Miranda G.
Rodolfo Nazar S.
Rodrigo Cataldo de la C.

Keywords

arrested pneumatization, sphenoid sinus, skull base, head and neck imaging

Abstract

Arrested pneumatization of the paranasal sinuses is an under-recognized benign condition, which consists of a variation of the normal pneumatization, with fatty bone marrow remai- ning within the cavity, more frequent in the sphenoid sinus. It is generally asymptomatic, and its diagnosis is usually incidental in the context of imaging for other causes, with defi- ned imaging criteria for this condition. Its management is expectant and its distinction from other differential diagnoses is essential, in order to avoid invasive procedures and treat- ments that only contribute morbidity. We present two cases of 15- and 16-year-old patients who, on imaging for another reason, show heterogeneous sphenoid lesions with low-signal foci suggestive of calcifications, with characteristics compatible with arrested pneumatiza- tion of the sphenoid sinus.

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