Som P M, Brandwein M S, Maldjian C, Reino A J, Lawson W
Department of Radiology, Mount Sinai School of Medicine, City University of New York, NY 10029.
AJR Am J Roentgenol. 1994 Sep;163(3):689-92. doi: 10.2214/ajr.163.3.8079869.
Inflammatory pseudotumor is a chronic inflammatory lesion of unknown origin. The purpose of this study was to analyze the CT and MR findings in six cases of inflammatory pseudotumor of the maxillary sinus in order to determine if there were any imaging findings that distinguish this lesion from the more common type of pseudotumor that occurs in the orbit.
Six patients with pseudotumor of the maxillary sinus were identified retrospectively. The diagnosis was based on biopsy specimens. Their CT scans and MR images were studied by two radiologists to identify specifically the presence of soft-tissue disease and the presence and type of any bone involvement.
CT and MR images showed some degree of involvement of the bony wall in all cases. All patients had a soft-tissue mass with mild enhancement on CT scans and intermediate signal intensity on both T1- and T2-weighted MR images.
Our experience shows that inflammatory pseudotumor of the maxillary sinus causes bone changes on CT and MR images, findings that mimic a malignant tumor. Bone involvement appears to be more common in pseudotumor of the maxillary antrum than in its orbital counterpart.
炎性假瘤是一种病因不明的慢性炎症性病变。本研究的目的是分析6例上颌窦炎性假瘤的CT和MR表现，以确定是否存在能将该病变与更常见的眼眶炎性假瘤相鉴别的影像学表现。
回顾性确定6例上颌窦炎性假瘤患者。诊断基于活检标本。两名放射科医生研究了他们的CT扫描和MR图像，以明确软组织病变的存在以及任何骨质受累的情况和类型。
CT和MR图像显示所有病例的骨壁均有一定程度的受累。所有患者均有软组织肿块，CT扫描表现为轻度强化，T1加权和T2加权MR图像上均呈中等信号强度。
我们的经验表明，上颌窦炎性假瘤在CT和MR图像上会引起骨质改变，这些表现类似于恶性肿瘤。上颌窦炎性假瘤的骨质受累似乎比眼眶炎性假瘤更为常见。
