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An unusual radiologic pattern of cryptogenic organizing pneumonia: diffuse pulmonary nodules in a leukemia patient.
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MedLine Citation:
PMID:  19182510     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The radiological appearance of diffuse discrete pulmonary nodules associated with cryptogenic organizing pneumonia (COP) has been rarely described. We describe a case of COP in 49-year-old woman with acute myeloid leukemia who developed diffuse pulmonary nodules during the second course of induction chemotherapy. The clinical status of the patient and imaging findings suggested the presence of a pulmonary metastasis or infectious disease. A video-assisted thoracoscopic lung biopsy resulted in the unexpected diagnosis of COP as an isolated entity. Steroid therapy led to dramatic improvement of the clinical symptoms and the pulmonary lesions.
Authors:
Kai Hsiung Ko; Hsian He Hsu; Woei Yau Kao; Ching Feng Chang; Ming Fang Cheng; Guo Shu Huang
Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Korean journal of radiology : official journal of the Korean Radiological Society     Volume:  10     ISSN:  1229-6929     ISO Abbreviation:  Korean J Radiol     Publication Date:    2009 Jan-Feb
Date Detail:
Created Date:  2009-02-02     Completed Date:  2009-04-30     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  100956096     Medline TA:  Korean J Radiol     Country:  Korea (South)    
Other Details:
Languages:  eng     Pagination:  93-6     Citation Subset:  IM    
Affiliation:
Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan.
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MeSH Terms
Descriptor/Qualifier:
Cryptogenic Organizing Pneumonia / complications,  radiography*
Diagnosis, Differential
Female
Humans
Leukemia, Myeloid, Acute / complications*,  pathology
Lung / radiography*
Lung Neoplasms / radiography,  secondary
Middle Aged
Multiple Pulmonary Nodules / complications,  radiography*
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Korean J Radiol
Journal ID (publisher-id): KJR
ISSN: 1229-6929
ISSN: 2005-8330
Publisher: The Korean Society of Radiology
Article Information
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Copyright © 2009 The Korean Society of Radiology
open-access:
Received Day: 21 Month: 4 Year: 2008
Accepted Day: 19 Month: 6 Year: 2008
Print publication date: Season: Jan–Feb Year: 2009
Electronic publication date: Day: 05 Month: 2 Year: 2009
Volume: 10 Issue: 1
First Page: 93 Last Page: 96
ID: 2647170
DOI: 10.3348/kjr.2009.10.1.93
PubMed Id: 19182510

An Unusual Radiologic Pattern of Cryptogenic Organizing Pneumonia: Diffuse Pulmonary Nodules in a Leukemia Patient
Kai-Hsiung Ko, MD1
Hsian-He Hsu, MD1
Woei-Yau Kao, MD2
Ching-Feng Chang, MD1
Ming-Fang Cheng, MD3
Guo-Shu Huang, MD1
1Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taiwan, Republic of China.
2Division of Hematology and Oncology, Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taiwan, Republic of China.
3Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taiwan, Republic of China.
Correspondence: Address reprint requests to: Hsian-He Hsu, MD, Department of Radiology, Tri-Service General Hospital, 325, Cheng-Kung Road, Sec. 2, Taipei, 114, Taiwan, Republic of China. Tel. +886-2-8792-7244, Fax. +886-2-8792-7245, hsianhe@yahoo.edu.tw

The typical radiological appearance of cryptogenic organizing pneumonia (COP) is the presence of bilateral peripheral patchy air-space opacities (1). The presence of diffuse nodular infiltration mimicking multiple pulmonary metastases is a rare finding for this disease. We report a case of a patient with acute myeloid leukemia (AML) who presented with this unusual manifestation after chemotherapy to emphasize the importance of early recognition and the use of prompt steroid therapy for this treatable condition.


CASE REPORT

A 49-year-old, nonsmoking female had been treated for AML with one course of induction chemotherapy with the use of daunorubicin and cytosine arabinoside (ARA-C). After relapse of AML, the patient was treated with 10 mg/m2 IV mitoxantrone daily for six days and 3 g/m2 IV ARA-C, daily for six days. On day six, flu-like symptoms including fever and cough developed after completion of the chemotherapy. On examination, the patient had an elevated temperature (38.5 ℃) and tachypnea. Chest auscultation revealed diffuse bilateral inspiratory crackles. The results of arterial blood gas analysis in room air were as follows: PaO2 92 mmHg, PaCO2 30 mmHg and pH, 7.37. The results of a laboratory evaluation were as follows: hemoglobin level, 104 g/L; platelet count, 140,000/µL; white blood cell count, 11,100/µL. The level of C-reactive protein and the erythrocyte sedimentation rate did not increase. Chest radiograph showed mild linear and small patchy opacities in both lower lung fields. Multiple blood and sputum cultures drawn were all negative. Fiberoptic bronchoscopy showed patent airways and the bronchoalveolar lavage (BAL) fluid was non-diagnostic. Culture and microscopy of sputum and BAL materials were negative for fungi, bacteria, acid-fast bacilli, Pneumocystis carinii and cytomegalovirus. Empirical antibiotic therapy was initiated for a case of presumed pneumonia.

Over the next few days, fever and cough persisted in spite of the antibiotic treatment. On day 11, chest radiograph demonstrated a bilateral and symmetrical distribution of multiple pulmonary nodules (Fig. 1A). Twenty hours later, a chest computed tomography (CT) scan confirmed the presence of numerous discrete 1-mm to 5-mm nodules throughout the lungs (Fig. 1B, C). Due to the poor response to the antibiotic treatment and the questionable diagnosis of pulmonary metastases, a video-assisted thoracoscopic lung biopsy with wedge resection of the posterior segment of the right upper lobe was performed on day 13. Histopathological analysis revealed that polypoid granulation tissue was filling the air spaces and foamy macrophages and inflammatory cells with interstitial pneumonia and air-space fibrosis were present, consistent with COP (Fig. 1D, E). Dramatic improvement of the clinical symptoms and radiographic abnormalities was noted after two weeks of appropriate steroid treatment (Fig. 1F), and the lesions were almost completely resolved after three weeks (Fig. 1G). At a follow-up visit one month after discharge, the patient remained asymptomatic and chest radiograph showed a stable appearance.


DISCUSSION

Cryptogenic organizing pneumonia is a distinct clinicopathological entity characterized by a subacute illness with shortness of breath, fever, cough, malaise and patchy peripheral air-space infiltrates as depicted on chest radiographs (1). Its full clinical spectrum and course are variable. The disease is defined histopathologically as granulation tissue plugs within the lumina of small airways, alveolar ducts and alveoli (2). Most cases are idiopathic and may be secondary to infections, a hematological malignancy, connective tissue disorders, drug administration, exposure to radiation or bone marrow or lung transplantation (2, 3).

Cryptogenic organizing pneumonia has a variable radiologic appearance and is usually characterized by unilateral or bilateral areas of patchy air-space consolidation with a subpleural and peribronchial distribution (1, 2). In a review of 14 patients with COP, Müller and colleagues (4) found no single finding or combination of findings that could be considered diagnostic of this disease. The presentation of a patient with diffuse discrete 1-mm to 5-mm pulmonary nodules associated with COP is uncommon. Correlation of the high-resolution CT abnormalities with the findings on video-assisted thoracoscopic biopsy suggest that the nodules seen on CT corresponded to localized areas of organizing pneumonia around the bronchiolitis obliterans. This pattern of lesions is separated from other involved bronchioles by a zone of relatively normal parenchyma, explaining the nodular appearance. The findings differ from the patchy or confluent nodular infiltrations usually associated with COP (5, 6). The clinical presentation in this case differs from that of neoplastic diseases, however, due to the rapid progression to diffuse nodules over a few days. Furthermore, multiple nodules are not always a sign of malignant disease, and benign lesions such as tuberculosis and fungal and parasitic infections should be considered in the differential diagnosis. Definitive differentiation of COP from infectious diseases by imaging studies, however, is usually not possible.

The absence of microorganisms in cultures of blood, sputum, and BAL fluid and the failure of empirical antibiotic treatment ruled out active infection at the onset of pulmonary symptoms in our patient. The factors responsible for COP in this case remain unclear but may include a direct immunologic reaction resulting from a possible subclinical viral infection, a toxic reaction to the chemotherapeutic agents and underlying hematological disease. However, whatever the etiology of COP in this case, the clinical symptoms and pulmonary lesions dramatically improved as the patient was responsive to steroid therapy. Further, early diagnosis prevented the patient from having rapidly progressive COP that is a deadly form of the disease and can occur in a small percentage of patients (7).

As pointed out in previous studies, benign pulmonary nodules in patients with an underlying malignancy have occasionally been seen in the setting of allogeneic bone marrow transplantation (8) or in chemotherapeutic drug toxicity (9). In our patient, the question of drug-induced COP arises as bone marrow transplantation was not performed and the clinical and radiological manifestations of pulmonary lesions developed after chemotherapy. Our patient, however, was not given bleomycin, which has been associated with nodular COP mimicking pulmonary metastases (10). The association between the administration of high-dose intravenous ARA-C and lung toxicity is well recognized, and Battistini et al. (11) reported the development of COP in three children with acute leukemia who received a combination of high-dose ARA-C and anthracyclines, which is similar to the regimen that was followed by our patient. Therefore, although undetectable infectious agents may be etiologic factors, chemotherapeutic toxicity can be presumed.

In conclusion, our patient had an unusual radiological pattern of diffuse discrete pulmonary nodules associated with COP that mimicked pulmonary metastases. The development of new pulmonary symptoms accompanied by a radiological manifestation of diffuse pulmonary nodules in cancer patients during chemotherapy should prompt consideration of this diagnosis so that appropriate steroid treatment can be initiated.


References
1. Preidler KW,Szolar DM,Moelleken S,Tripp R,Schreyer H. Distribution pattern of computed tomography findings in patients with bronchiolitis obliterans organizing pneumoniaInvest RadiolYear: 1996312512558724121
2. Cordier JF. Cryptogenic organising pneumoniaEur Respir JYear: 20062842244616880372
3. Morrish WF,Herman SJ,Weisbrod GL,Chamberlain DW. Bronchiolitis obliterans after lung transplantation: findings at chest radiography and high-resolution CTRadiologyYear: 19911794874902014297
4. Müller NL,Staples CA,Miller RR. Bronchiolitis obliterans organizing pneumonia: CT features in 14 patientsAJR Am J RoentgenolYear: 19901549839872108572
5. Akira M,Yamamoto S,Sakatani M. Bronchiolitis obliterans organizing pneumonia manifesting as multiple large nodules or massesAJR Am J RoentgenolYear: 19981702912959456931
6. Lee KS,Kullnig P,Hartman TE,Müller NL. Cryptogenic organizing pneumonia: CT findings in 43 patientsAJR Am J RoentgenolYear: 19941625435468109493
7. Cohen AJ,King TE Jr,Downey GP. Rapidly progressive bronchiolitis obliterans with organizing pneumoniaAm J Respir Crit Care MedYear: 1994149167016758004328
8. Tanaka N,Matsumoto T,Miura G,Emoto T,Matsunaga N. HRCT findings of chest complications in patients with leukemiaEur RadiolYear: 2002121512152212042962
9. Epler GR. Drug-induced bronchiolitis obliterans organizing pneumoniaClin Chest MedYear: 200425899415062600
10. Ben Arush MW,Roguin A,Zamir E,el-Hassid R,Pries D,Gaitini D,et al. Bleomycin and cyclophosphamide toxicity simulating metastatic nodules to the lungs in childhood cancerPediatr Hematol OncolYear: 1997143813869211543
11. Battistini E,Dini G,Savioli C,Morando A,Gandolfo A,Kotitsa Z,et al. Bronchiolitis obliterans organizing pneumonia in three children with acute leukaemias treated with cytosine arabinoside and anthracyclinesEur Respir JYear: 199710118711909163667

Article Categories:
  • Case Report

Keywords: Cryptogenic organizing pneumonia, Pulmonary nodules, Leukemia.

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