Paranasal sinus osteoma
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Mixed density bone lesion in the left frontal sinus.
The osteomas are benign bone tumors often settle in the sinuses being the most frequent, in order decreasing: the frontal sinus, ethmoidal cells and maxillary sinuses rarely and sphenoidal. They are slow-growing tumors, no tendency to become malignant and unknown etiology.
Most of these lesion do not cause symptoms and are detected incidentally on imaging studies.