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Pneumosinus dilatans is rare. It is defined as an expansion of one of paranasal sinuses. We discuss the etiopathogenic hypothesis of pneumosinus dilatans, its epidemiologic and clinical characteristics, and its therapeutic approaches. METHODS A man, 50 years old, presented frontal pneumosinus dilatans associated with multiple cerebral meningiomas, one of which was appended in the nasal cavity revealed by frontal deformation and nasal obstruction. CT and MRI confirmed the diagnosis. The patient was operated in the neurosurgery department, via the bicoronal approach, allowing the removal of meningioma and osteodural repair of the skull base. CONCLUSIONS Pneumosinus dilatans is a rare pathology with an unknown etiology. It mainly affects the frontal sinus. Its association with cerebral meningioma has been described in the medical literature. Treatment is surgical and is recommended for cases with aesthetic problems.
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