Most sinonasal tract hemangiopericytomas occur in the nasal cavity and in the maxillary sinus (Hervé et al. 1999). Imaging features of are nonspecific. On CT hemangiopericytoma appears as an expansile, soft tissue mass, which may be large and associated with bone remodeling or erosion (Mafee 1993). Calcifications may be present, enhancement ranges from moderate to relevant. On MR, hemangiopericytoma is intermediate to hyperintense on T2, low to intermediate on T1, and has a moderate to marked enhancement following contrast agent administration (Serrano et al. 2002) (Fig. 9.36).
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