Pseudotumor of the maxillary sinus in a patient with von Willebrand's disease.

Maxillary sinus haematoma

“…Further bleeding results in increasing pressure within the haematoma, and it expands to compress or erode neighbouring structures. 1,4 We reviewed the literature for all reports of spontaneous cases of maxillary haematoma. Table I illustrates the patient profiles and management for these patients.…”

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

“…On the other hand, in the English literature, there are only few papers on this disease. 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.…”

“…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].…”