Inflammatory Myofibroblastic Tumor Mimicking Invasive Thymoma: a case report
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1 中華放射醫誌 Chin J Radiol 2009; 34: Inflammatory Myofibroblastic Tumor Mimicking Invasive Thymoma: a case report Wei-Ti Huang Chin-Yin Sheu Fei-Shih Yang Department of Radiology, Mackay Memorial Hospital Inf lammatory myofibroblastic tumor is an unusual disease that is most commonly seen in the lung and orbit and extremely rare in the mediastinum. As far as we know, there have been only two case reports of mediastinal inflammatory myofibroblastic tumor occurring in patients over 40 years old. In literature, we found no such case of mediastinal inf lammatory myofibroblastic tumor that can present as invasive thymoma on the basis of the image pattern. Here, we report 57-year-old woman with anterior mediastinal inf lammatory myof ibroblastic tumor, which shows local invasion to the pericardium and central necrosis on chest CT scan. These uncommon image patterns have not been documented in literature and present diagnostic challenges. Inf lammatory myof ibroblastic tumor, also known as an inflammatory pseudotumor, xanthomatous pseudotumor, plasma cell granuloma, etc, is an uncommon disease that most commonly occurs in the lung and orbit [1]. Although it has been reported to be found in nearly all sites of the body, anterior mediastinum is an extremely rare location. So far there have been only two case reports of inflammatory myofibroblastic tumor in the mediastinum of patients over 40 years of age [2]. In literature, there is no case report of inflammatory myofibroblastic tumor mimicking invasive thymoma on the basis of image presentation. We report a 57-year-old woman who had an anterior mediastinal inf lammatory myofibroblastic tumor, which shows an uncommon image pattern presenting diagnostic challenges. Case report Reprint requests to: Dr. Chin-Yin Sheu Department of Radiology, Mackay Memorial Hospital. No. 92, Sec. 2, Chung Shan N. Road, Taipei 104, Taiwan, R.O.C. The 57-year-old women in her usual health status came to our outpatient department presenting with left chest pain for two months. There was no fever nor abnormal breath sound on physical examination. However, her chest plain film showed a bulging soft tissue mass in the left hilar region (Fig. 1). So she was admitted for further evaluation. The blood test revealed normal finding except high platelet level (522000/µL). CT scan was then performed (Fig. 2a, 2b). The tumor had no calcification and was located at the anterior mediastinum on non-enhanced image. After contrast administration, this tumor showed moderate homogenous enhancement with central necrosis. In addition, this tumor was tightly adjacent to the pericardium associated with pericardial effusion. Left-sided pleural effusion was also seen. The above imaging findings were highly suggestive of invasive thymoma with possible pericardium invasion. Other differential diagnoses include lymphoma, Castlesman disease and other mesenchymal tumor of mediastinum. The patient had sternotomy and pericardiectomy for tumor excision. A huge soft and yellowish mass about cm was found at anterior medias-
2 108 Inflammatory myofibroblastic tumor mimicking invasive thymoma tinum adhesive to peripheral tissue (Fig. 3). There was also 100c.c. yellowish pericardial effusion and 200c.c. bloody pleural effusion. The tumor easily bleeds during operation. The pathologic findings showed fibrovascular tissue heavily infiltrated with a mixture of acute and chronic inflammatory cells on hematoxylin and eosin stain (HE stain) (Fig. 4a). Inf lammatory cells including plasma cells, neutrophils, lymphocytes and histiocytes were confirmed by CD68 immunostain (Fig. 4b). Spindle cell proliferation and scattered large mononuclear and multinucleated cells were observed. Some were positive for smooth muscle actin and all were negative for ALK, CD30, CD15 and S-100 protein (Fig. 4c, 4d). The above findings were suggestive of inflammatory myofibroblastic tumor. The pericardium showed only reactive change microscopically. The patient has been well without umor recurrence or chest pain one year after surgery. pseudotumor or plasma cell granuloma (especially found in the heart) because of its complexity and variable histologic characteristics and behavior [1]. Discussion Inf lammatory myofibroblastic tumor is an uncommon, quasineoplastic lesion that was first observed in the lung and described by Brunn in 1939, and was named as inflammatory pseudotumor by Umiker et al in 1954 [1, 3]. It has been described by many other different names such as xanthomatous Figure 1. Chest radiography shows a bulging soft tissue density at the left hilar area. 2a 2b Figure 2. a. Non-enhanced CT image shows an anterior mediastinal tumor without calcification. b. Enhanced CT image shows central necrosis of the tumor. The tumor is tightly adjacent to the pericardium with pericardial effusion and left pleural effusion.
3 Inflammatory myofibroblastic tumor mimicking invasive thymoma 109 Figure 3. The post-operative finding shows a cm mass at anterior mediastinum with adhesion to peripheral tissue. To the best of our knowledge, inflammatory myofibroblastic tumor most commonly involves the lung and the orbit, and it usually occurs in children and young adult [1, 2, 5]. Besides, it is also the most common primary tumor of the lung in childhood [4]. Most of the patients are asymptomatic, but some may seek medical help because of cough, dyspnea, chest pain, or hemoptysis. Also, some of the patients may have an elevated erythrocyte sedimentation rate (ESR), mild anemia, or thrombocytosis [5]. The cause of inflammatory myofibroblastic tumor is still unknown [1, 6]. The histologic characteristics may vary from benign to malignant. And three main histologic patterns have been typically described: 1. Scarce, loosely arrayed spindle cells with a myxoid, vascular, and inflammatory proliferation resembling granulation tissue or nodular fasciitis. 2. Abundant, compact spindle cells with inflammation resembling fibrous histiocytoma or fibromatosis. 3. Sparse, 4a 4b 4c 4d Figure 4. a. Histopathologic findings show fibrovascular tissue heavily infiltrated with a mixture of acute and chronic inflammatory cells. (HE stain 200X) b. Inflammatory cells including plasma cells, neutrophils, lymphocytes and histiocytes were confirmed (CD68 100X) c. Some of the spindle cells are positive for smooth muscle actin (Actin 100X) d. ALK immunostain showed all negative. CD30, CD15 and S-100 protein (not shown) also showed all negative.
4 110 Inflammatory myofibroblastic tumor mimicking invasive thymoma dense plate-like collagen with entrapped inflammatory cells resembling a desmoids tumor or scar [5, 6]. Though lung and orbit are the most common organs involved in this disease, almost every site in the body has been reported to have been affected. Initial image examination may occasionally show pulmonary inf lammatory myofibroblastic tumor with mediastinum invasion [3]. In fact, the mediastinum is rarely a primary location of inf lammatory myofibroblastic tumor, with the occurrence rate of % in several large studies [2, 5]. After reviewing previous studies, we can find only two cases of mediastinal inflammatory myofibroblastic tumor that occurred in patients over 40 years old [2]. Although there is a case report that inflammatory myofibroblastic tumor in the mediastinum presenting as superior vena cava syndrome on CT image and the other case report about pulmonary inflammatory myofibroblastic tumor with mediastinal invasion mimicking thymoma, there has been as yet no report that primary anterior mediastinal inf lammatory myofibroblastic tumor can present itself as an invasive thymoma on image study [1, 3, 7, 8]. There are many differential diag noses of anterior mediastinal tumor, such as thymic tumor, lymphoma, Castleman disease, germ cell tumor, or intrathoracic thyroid goiter. According to previous study [9], thymic tumors such as invasive thymoma or thymic carcinoma often show more heterogeneous enhancement on CT image study. Some may show pleural or pericardial implants or invasion. As anterior mediastinal lymphoma, we may see more prominent mediastinal lymphadenopathy. The main tumor may demonstrate homogenous attenuation with little if any enhancement. In addition, the hallmark of Castleman disease is strongly enhancing lymph nodes. As compared with our case, this tumor has no significant image character and is similar to invasive thymoma in imaging characteristics due to highly suspicion of pericardium invasion. But other mesenchymal tumor of mediastinum may also have the same image presentation. It is very difficult to make a definite diagnosis on the basis of CT imaging findings. In such case, surgical approach and pathologic diagnosis play very important roles. Here, we report a case of anterior mediastinal inflammatory myofibroblastic tumor in a 57-year-old female patient, who showed an uncommon image pattern mimicking an invasive thymoma. This image presentation has not been described previously. As compared with previous study and our case, we could know that mediastinal inf lammatory myofibroblastic tumor can present as superior vena cava syndrome, pericardium invasion, or tumor necrosis [1, 3, 5, 7, 8]. But these image findings are not specific so as to facilitate a definite diagnosis. Further surgical and pathologic diagnoses are very important for such a case. References 1. Narla LD, Newman B, Spottswood SS, Narla S, Kolli R. Inflammatory pseudotumor. Radiographics 2003; 23: Makimoto Y, Nabeshima K, Iwasaki H, et al. Inflammatory myofibroblastic tumor of the posterior mediastinum: an older adult case with anaplastic lymphoma kinase abnormalities determined using immunohistochemistry and fluorescence in situ hybridization. Virchows Arch 2005; 446: Agrons GA, Rosado-de-Christenson ML, Kirejczyk WM, Conran RM, Stocker JT. Pulmonary inflammatory pseudotumor: radiologic features. Radiology 1998; 206: Crespo C, Navarro M, González I, Lorente MF, González R, Mayol MJ. Intracranial and mediastinal inflammatory myfibroblastic tumour. Pediatr Radiol 2001; 31: Coffin CM, Watterson J, Priest JR, Dehner LP. Extrapulmonary inflammatory myofibroblastic tumor (inflammatory pseudotumor). A clinicopathologic and immunohistochemical study of 84 cases. Am J Surg Pathol 1995; 19: Gorospe L, Fernández-Gil MA, Torres I, Tovar J, García-Miguel P, Tejerina E. Misleading lead: inflammatory pseudotumor of the mediastinum with digital clubbing. Med Pediatr Oncol 2000; 35: Mountney J, Suvarna SK, Brown PW, Thorpe JA. Inflammatory pseudotumour of the lung mimicking thymoma. Eur J Cardiothorac Surg 1997; 12: Yamag uchi M, Yoshino I, Osoegawa A, et al. Inf lammatory myofibroblastic tumor of the mediastinum presenting as superior vena cava syndrome. J Thorac Cardiovasc Surg 2003; 126: Pamela MT, Elliot KF, Janet EK. CT evaluation of the anterior mediastinum: spectrum of disease. Radiographics 1994; 14:
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