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

Case 217: Sinonasal Organized Hematoma

“…SOH is an uncommon benign entity that has been described with various other terms in the literature, including blood boil, pseudotumor, hematoma, organizing hematoma, and hematomalike mass of the maxillary sinus (1,2). Although the precise etiology of maxillary SOH is unclear, a fibrous capsule forms around the hematoma.…”

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

“…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.…”

“…More conspicuous characteristics are seen on MRI. The lesion has a clear contour often surrounded by edematous sinus mucosa, and shows intermingled heterogeneous low/intermediate/high signal intensity on both T1-and T2-weighted MRI [2,6,9,10].…”

Angiomatous-Angiectatic Nasal Polyps: A Varied Clinical, Radiological and Histomorphological Spectrum

“…[13] Areas of mixed signal intensity on T2 weighted images are supposed to be caused by the extensive areas of organized thrombus and necrosis in that part of polyp and the peripheral hypointense rim on T2 weighted images due to old microhemorrhage with hemosiderin deposition on the surface of the polyp. [3,14] Post contrast strong enhancement of nasochoanal portion of ANP suggest extensive vascular proliferation and ectasis. [3,7] Transnasal endoscopic surgical excision is the treatment of choice without concern for significant blood loss and ANPs rarely recur.…”