Subperiosteal hematoma of the orbit is a rare complication of ethmoidal sinusitis presenting most commonly in adults. The authors report a unique case who had subperiosteal hematoma of the orbit secondary to ethmoidal sinusitis. She was referred to our hospital with the diagnosis of orbital abscess and magnetic resonance imaging disclosed an extraconal mass in the upper part of the left orbit. A left frontal craniotomy was performed after aspiration of purulent material from ethmoid sinus using endoscopic approach, and a brownish black hematoma material was removed. This patient is the second reported case of subperiosteal hematoma of the orbit misdiagnosed as orbital abscess in the current literature. The presented case exemplifies the fact that early diagnosis and prompt intervention is very important to avoid possible complications often associated with this disease. Case Report A 70-year-old woman was presented with sudden onset of severe pain in the left orbital region and proptosis. The patient had been treated with systemic antibiotic treatment with the diagnosis of orbital cellulitis at another institution for two weeks, but she was afebrile and had no history of trauma, bleeding disorder, severe physical exertion, straining, or vomiting. Her medical history revealed hypertension. There was no change in the complaints of the patient over the course of the medical treatment, and she had been referred to our hospital with the diagnosis of orbital abscess.
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