Case 217: sinonasal organized hematoma.

HISTORY: A 15-year-old boy presented to the emergency department with intractable epistaxis. He had a prior history of epistaxis typically lasting 5-10 minutes and consisting of up to four episodes per year for several years. Otherwise, the patient had no relevant medical history, and he denied having prior trauma, surgery, bleeding diathesis, fever, chills, or vision changes. Likewise, the patient had no relevant family history. The patient's coagulation panel was unremarkable and included a prothrombin time of 15.4 seconds, an international normalized ratio of 1.2, and a partial thromboplastin time of 29.3 seconds. A thin-section unenhanced sinus computed tomography (CT) examination was performed. In addition, magnetic resonance (MR) imaging of the sinuses without and with intravenous contrast material was performed. The epistaxis was treated with nasal packing, which prevented further bleeding. Biopsy of the lesion was subsequently performed.