Organized hematoma of the maxillary sinus mimicking tumor

Case 217: Sinonasal Organized Hematoma

“…The fibrous capsule impedes resorption of the hematoma and stimulates neovascularization, which in turn promotes recurrent intracapsular hemorrhage. This sequence of events accounts for progressive expansion, with local bony demineralization associated with the organized hematoma (3)(4)(5). Although not present in this patient, predisposing factors for the development of SOH include trauma or sinus surgery, radiation, fungal infection, bleeding diathesis, or underlying hemorrhagic lesion (1,6).…”

Expansile Organized Maxillary Sinus Hematoma: MR and CT Findings and Review of Literature

“…Fewer than 100 cases [1][2][3][4][5][6][7][8] have been reported to our knowledge. The mass usually originates in a single maxillary sinus and is generally located in the medial antral wall near the sinus ostium.…”

“…A bleeding diathesis, an aggressive fungal infection, radiation therapy, a postoperative complication, or trauma are also po-tential causes of a similar condition. [5][6][7][8][9] The photomicrograph of the histopathologic specimen in our subjects shows excessive endothelial proliferation with adjacent subacute and chronic hematoma and surrounding fibrous tissue margin. Histopathologic findings and clinical course in our subjects resemble those from other reports of hematomas of the maxillary sinus.…”

Endoscopic Sinus Surgery for the Treatment of Organized Hematoma of the Maxillary Sinus

“…A case report by Ozhan et al [2] in 1996 is the first English document about organized hematoma of the maxillary sinus, which was associated with von Willebrand's disease. At a later time, in the 2000s, organized hematoma of the maxillary sinus was reported in patients without bleeding diathesis [3], and was recognized to often be an idiopathy. This disease has been otherwise referred to as hemophilic pseudotumor [2] or a hematoma-like mass [6], but the term "organized hematoma" is most commonly accepted [3,5,[7][8][9][10].…”

“…No bilaterally-affected case has been reported to date. On contrast-enhanced images, enhancement is usually patchy and heterogeneous [7][8][9][10], but may occasionally be faint and unremarkable [2][3][4]. More conspicuous characteristics are seen on MRI.…”