Purpose : To report a case of exophthalmos related to frontal and ethmoid sinusitis with subperiosteal abscess .

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Subperiosteal abscess mani-fested as periosteal elevation and anechoic area between the periosteum and the bone cortex were detected in 6 of the 15 patients .

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No subperiosteal abscess was detected in the remaining 9 patients who had proven soft-tissue infection .

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Conclusion : Subperiosteal abscess of orbit can result in multiple complications such as loss of vision osteomyelitis cavernous sinus thrombosis intracranial infection and abscess .

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Prompt diagnosis and appropriate management of subperiosteal abscess are essential to not only avoid life threatening complications but also preserve visual acuity of the patient .

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