Sinonasal Organized Hematoma: CT and MR Imaging Findings

Abstract

An expansile soft tissue mass, smooth sinus wall erosion, marked heterogeneous signal intensity with a hypointense peripheral rim on T2-weighted MR images, and marked irregular nodular, papillary, or frondlike enhancement are characteristic CT and MR imaging findings of sinonasal OH.

Apparent Diffusion Coefficient Mapping for Sinonasal Diseases: Differentiation of Benign and Malignant Lesions

“…On MR images, the lesion is often described as an expansile soft-tissue mass with sinus wall erosion, heterogeneous signal intensity with a hypointense peripheral rim on FS T2-weighted MR images, and papillary enhancement after contrast medium injection. 15 However, the imaging features are often nonspecific. In organized hematomas, organized or coagulated hematoma areas may be associated with low ADCs.…”

MR Evaluation of Sinonasal Angiomatous Polyp

“…3,[8][9][10][11] The conventional MR imaging findings of SAP, however, have been described in only a few articles. 2,4,8,13 In addition, its features on DCE MR imaging and DWI have not been systematically reviewed, to our knowledge. The purpose of this study was to describe not only the characteristics of conventional MR imaging but also those of DCE MR imaging and DWI in SAP.…”

“…1 Without knowledge of the typical clinical presentation and the complete study of imaging findings, the entity tends to be clinically and radiologically confused with neoplastic processes and even malignancy. 2 This entity has been described in the literature in different terms, including cavernous hemangioma, [3][4][5][6][7] organized or organizing hematoma, [8][9][10][11] hematoma-like mass of the maxillary sinus, 12 and SAP. 1,2,13,14 This lesion is difficult to remove en bloc and is easily broken during excision, so the sampling inconsistencies related to lesional fragility are likely responsible for the wide variation in pathologic description and terminology.…”

Angiomatous nasal polyp: Clinical diagnostic dilemma

“…5 Predominant features of infarcted ANPs are clusters of ectatic blood vessels surrounded by abundant fibrin-like eosinophilic extracellular material 4 and superimposed fibrinoid necrosis, luminal thrombosis of ectatic blood vessels. 1,2,3,6 These polyps can grow very fast and thus result in bone erosion that could mimic malignancy clinically and thus result in diagnostic dilemma. 3 In angiectatic polyps, scattered atypical pleomorphic spindle cells (Myofibroblasts) in the stroma are quite common whereas less common in sinonasal polyp.…”

“…10 The vascular lamina of cavernous hemangioma is usually larger than those of angiomatous polyp. 6 Histomorphology, age, sex, and site helps in differentiation. Angiofibroma occurs in young males, whereas sinonasal angioma do not show age or sex predilection.…”