- Case report
- Open Access
A surgical case of eosinophilic angiocentric fibrosis of the lung
© Okamoto et al. 2015
Received: 15 March 2015
Accepted: 10 June 2015
Published: 17 June 2015
Eosinophilic angiocentric fibrosis (EAF) is an uncommon inflammatory disease that develops from the respiratory organs and affects them. Almost all reports about EAF describe lesions affecting the upper respiratory tract. We present the first case of EAF of the lung treated by surgical excision. A 69-year-old female consulted our hospital following the detection of an abnormal chest shadow with chronic cough. Chest computed tomography showed a pulmonary growing mass in the right hilar area, which corresponded to an enhanced accumulation on positron emission tomography. We doubted a pulmonary malignant tumor and performed a right upper lobectomy. Pathological and other clinical presentations revealed EAF of the lung without coexisting systemic diseases. The patient had an uncomplicated postoperative course, and the presenting cough had improved. EAF can involve the lung and cause symptomatic airway obstruction. For a hilar region mass with imaging characteristics similar to those of lung cancer, a differential diagnosis must be considered.
Eosinophilic angiocentric fibrosis (EAF) is a rare disorder typically involving the upper respiratory tract, although it may very rarely affect the lower respiratory tract. Furthermore, EAF lacks an established treatment. Almost all reported cases were surgically treated and pulmonary lesions have never been reported. EAF is considered a progressive benign disorder, and the diagnosis is chiefly based on histopathological findings  more specifically the presence of an inflammatory infiltrate with numerous eosinophils and fibro-inflammatory lesions. The perivascular fibrotic changes are characterized by a whorled, “onion skin”-type pattern [1, 2].
The etiology of this progressive disorder is unknown . It has been suggested that several conditions act as predisposing factors, but the evidence in this regard is lacking. We present the first case of EAF manifesting as a pulmonary lesion.
We suspected the concurrent presence of a systemic disease, such as IgG4-related disorders and granulomatosis with polyangitis (GPA), and repeated blood tests using preoperative preserved blood. Serological assays for IgG, IgE, IgG4, cytoplasmic anti-neutrophil antibody (c-ANCA), as well as urinalysis, were all negative. The only positive finding was the presence of perinuclear anti-neutrophil antibodies (p-ANCA, 19.1 U/mL). However, there were no other clinical findings, such as retroperitoneal fibrosis or active inflammation, which would have been consistent with the diagnostic criteria for these diseases. Finally, we diagnosed EAF of the lung. The p-ANCA levels decreased postoperatively (12.1 U/mL), and the presenting cough had improved. We recommended regular follow-up, and the patient has so far been recurrence-free.
EAF is a rare disorder that involves the upper respiratory tract, which is diagnosed on the basis of the characteristic pathological findings, as previously mentioned [1–3]. The histopathological diagnosis takes two possible disease progression states into consideration: an inflammatory state and a fibrotic state [4, 5]. It is considered that the disease progresses from the early-state inflammatory lesion, with numerous eosinophils and perivascular onion skin fibrosing to a late state characterized by subsequent perivascular fibrosis formation and decreased inflammatory infiltration. In our case, the resected specimen contained these metachronous states, with an early state predominance. The enhanced accumulation on FDG-PET reflected the inflammatory cell infiltration and indicated a high-activity lesion. EAF of the lung should be considered in the differential diagnosis of a hilar mass lesion with abnormal accumulation that mimics lung cancer.
The etiology of EAF is unknown; atopy, trauma, surgery, and immunologic disease have been proposed as predisposing factors, but none of these is supported by evidence [6, 7]. Deshpande et al. reported five cases of EAF and concluded that EAF belongs to a spectrum of IgG4-related disorders . In their cases, numerous IgG4-positive plasma cells have been observed in EAF biopsy samples, together with elevated serum IgG4 levels . Although our case showed similar pathological findings, other laboratory results did not concur. We did not reach the definite the diagnosis for IgG4-related disease.
The differential diagnosis of pulmonary EAF includes GPA and eosinophilic GPA (EGPA) [3, 9], both systemic diseases with lung involvement. The most important histopathological distinguishing features are necrosis and vasculitis, which are not observed in EAF in our case. In addition, our patient lacked the diagnostic clinical findings associated with GPA and EGPA [10, 11]. The only positive serum assay was p-ANCA, which are the autoantibodies observed characteristically in EGPA. However, they are observed only in half of the EGPA cases, and the criteria proposed by the American College of Rheumatology do not include p-ANCA . Our patient had not any clinically associated presentation. Consequently, we did not reach the definite diagnosis for these diseases.
While EAF is a benign disorder that involves the upper respiratory tract and leads to airway obstruction, the obstructive symptoms develop gradually because EAF is slow growing and progressive. Kim et al. reported a case of EAF that occurred in the bronchial lumen of a patient who presented with respiratory distress . Similarly, in our case, chronic cough appeared as a local manifestation and disappeared after surgical treatment. If bronchial narrowing had progressed, disorders such as obstructive pneumonia would have developed. The medical treatment of EAF is not established. Therefore, surgical treatment for symptomatic relief was required in most of the reported cases. Whenever surgical resection is deemed feasible, it is desirable to intervene before the obstruction becomes severe. Among the cases where surgical excision was performed, one recurrence was described following a non-total resection . Even in the case of a pulmonary lesion, a total resection may be required, and we therefore insist on the confirmation of the surgical margin by intraoperative rapid diagnosis.
In our case, EAF was not associated with a co-existing systemic disease. As previously described, EAF is an inflammatory disorder of uncertain origin. However, it is not known if EAF is a partial manifestation of a systemic illness, which highlights the importance of performing an adequate evaluation. As reported by Rimmer et al. , the possibility of advancing toward the development of these diseases is an important concern. Careful follow-up after surgery is also important.
We report a surgical case of EAF of the lung that mimicked lung cancer. EAF is an unidentified benign disorder, but its growth can adversely affect organ function. In the case of a pulmonary lesion, it is desirable to completely remove it surgically before the development of airway obstruction. In addition, it is necessary to explore the possibility of an underlying systemic disease before making the diagnosis.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
- Nguyen DB, Alex JC, Calhoun B. Eosinophilic angiocentric fibrosis in a patient with nasal obstruction. Ear Nose Throat J. 2004;83(3):183–6.PubMedGoogle Scholar
- Sunde J, Alexander KA, Reddy VV, Woodworth BA. Intranasal eosinophic angiocentric fibrosis: a case report and review. Head Neck Pathol. 2006;4(3):246–8.View ArticleGoogle Scholar
- Li Y, Liu H, Han D, Zang H, Wang T, Hu B. Eosinophilic angiocentric fibrosis of the nasal septum. Case Rep Otolaryngol. 2013;2013:267285.PubMed CentralPubMedGoogle Scholar
- Deshpande V, Khosroshahi A, Nielsen GP, Hamilos DL, Stone JH. Eosinophilic angiocentric fibrosis is a form of IgG4-related systemic disease. Am J Surg Pathol. 2013;35(5):701–6.View ArticleGoogle Scholar
- Kim WJ, Kim YI, Kim JE, Choi YH, Cho HH, et al. Unexplained persistent dyspnea in a young woman with eosinophilic angiocentric fibrosis. Respir Care. 2014;59(5):e72–6.PubMedView ArticleGoogle Scholar
- Paun S, Lund VJ, Gallimore A. Nasal fibrosis: long-term follow up of four cases of eosinophilic angiocentricfibrosis. J Laryngol Otol. 2005;119(2):119–24.PubMedView ArticleGoogle Scholar
- Yang BT, Song ZL, Wang YZ, Dong JY, Wang ZC. Solitary fibrous tumor of the sinonasal cavity: CT and MR imaging findings. AJNR Am J Neuroradiol. 2013;34(6):1248–51.PubMedView ArticleGoogle Scholar
- Umehara H, Okazaki K, Masaki Y, Kawano M, Yamamoto M, et al. Comprehensive diagnostic criteria for IgG4-related disease (IgG4-RD). Mod Rheumatol. 2001;22(1):21–30.View ArticleGoogle Scholar
- Loane J, Jaramillo M, Young HA, Kerr KM. Eosinophilic angiocentric fibrosis and Wegener’s granulomatosis: a case report and literature review. J Clin Pathol. 2001;54(8):640–1.PubMed CentralPubMedView ArticleGoogle Scholar
- Leavitt RY, Fauci AS, Bloch DA, Michel BA, Hunder GG, et al. The American College of Rheumatology 1990 criteria for the classification of Wegener’s granulomatosis. Arthritis Rheum. 1990;33(8):1101–7.PubMedView ArticleGoogle Scholar
- Masi AT, Hunder GG, Lie JT, Michel BA, Bloch DA, et al. The American College of Rheumatology 1990 criteria for the classification of Churg-Strauss syndrome (allergic granulomatosis and angiitis). Arthritis Rheum. 1990;33(8):1094–100.PubMedView ArticleGoogle Scholar
- Rimmer J, Andrews P, Lund VJ. Eosinophilic angiocentric fibrosis of the nose and sinuses. J Laryngol Otol. 2014;128(12):1071–7.PubMedView ArticleGoogle Scholar
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