Undifferentiated connective tissue disease presenting with prevalent interstitial lung disease: Case report and review of literature
© Lunardi et al; licensee BioMed Central Ltd. 2011
Received: 4 April 2011
Accepted: 7 June 2011
Published: 7 June 2011
Undifferentiated connective tissue diseases (UCTDs) are clinical entities characterised by signs and symptoms suggestive of a systemic autoimmune disease, which do not fulfil the diagnostic criteria for a defined connective tissue disease. Lung involvement can complicate the course and management of the disease, often determining a worse outcome. Respiratory dysfunction as the first clinical manifestation has seldom been reported.
We describe a case of a female patient who developed significant respiratory dysfunction as the principal clinical sign. Video-assisted thoracoscopy was performed and a histological pattern of nonspecific interstitial pneumonia (NSIP) was found. A pathological diagnosis suggested careful follow-up with extensive immunological screening which then detected Raynaud's phenomenon and positivity of antinuclear antibodies. After a multidisciplinary discussion (pneumologist, radiologist, pathologist and rheumatologist) a final diagnosis of NSIP associated with UCTD was made. The diagnosis of UCTD should be considered when NSIP is diagnosed even in cases with evident first clinical manifestations of severe respiratory dysfunction. A multidisciplinary approach in the field of interstitial lung disease with NSIP, also including rheumatologic expertise, is fundamental to achieve a prompt and correct diagnosis.
The term undifferentiated connective tissue disease (UCTD) is used to define clinical entities characterised by features suggestive of CTD which do not meet the classification criteria of the American College of Rheumatology for a specific single disease, such as systemic lupus erythematosus, systemic sclerosis, polymyositis/dermatomyositis, and Sjögren's syndrome [1–9]. UCTD can evolve in these patients over time.
As only a few reports have described lung involvement during UCTD the natural history still remains unknown and unpredictable. Interstitial lung disease (ILD) with a histological pattern of non specific interstitial pneumonia (NSIP) has recently been reported to be the most frequent lung manifestation [10–13], usually responsible for progression and adverse outcome of the disease. Lung involvement as the first clinical manifestation of UCTD is rarely reported. We discuss the case and review the associated literature of UCTD.
A 50-year-old non-smoking female textile worker after a flu-like episode started to suffer from dry cough and progressive dyspnoea. Chest radiography showed parenchymal pulmonary opacity in the lower posterior segment of the right haemithorax and bilateral interstitial thickening of the lower pulmonary segment. The patient was therefore treated with antibiotics and steroids but the clinical and radiological manifestations did not improve.
Open lung biopsy was performed and based on a histological diagnosis of non specific interstitial pneumonia (NSIP) an accurate immunological follow-up was required.
Therefore, the patient was discharged and started a treatment regimen of oral cyclophosphamide (100 mg/die) and prednisone (25 mg/die) for 12 months. The combination was then stopped and the patient was followed only with low dose of corticosteroids.
Up to now, over a follow-up period of three years, the clinical picture and the pulmonary function test remain stable and no definitive CTD has developed.
Up to 25% of patients who show clinical and laboratory features of systemic autoimmune diseases do not fulfil the classification criteria of ACR for a specific CTD and they are considered to have a distinct clinical entity, called UCTD [1, 4, 7, 8]. The definition is still under debate, although it is becoming more definite. In 1999 and 2006 Mosca et al. reviewed the literature and proposed that preliminary classification criteria for UCTD include the following: at least one clinical manifestation of CTD, positive ANA results, and a disease duration of at least three years [4, 8].
It may be difficult to distinguish these conditions from early phases of defined diseases such as systemic lupus erythematosus, systemic sclerosis and others. The natural history of these rare entities is variable: a high percentage of patients with UCTD maintain an undifferentiated clinical course and do not evolve to a distinct CTD, whereas some patients can evolve over time [4, 7, 8, 11].
Laboratory test screening is essential to identify markers that may suggest a systemic, autoimmune disease, or specific organ involvement. In fact, about 90% of the patients with UCTD show positive ANA [1, 5]. Capillaroscopy is useful to detect abnormalities in capillary shape and blood flow, which suggest features of Raynaud's phenomenon.
The onset of UCTD is similar to most CTDs, peaking in the middle years of life. There are no specific signs or symptoms of UCTDs because these entities present manifestations common to other CTDs. The main clinical features at onset of UCTD are arthritis and arthralgia, Raynaud's phenomenon, pleuritis and pericarditis, xerostomia and xerophtalmia, leukopenia, esophageal involvement, fever and myositis [1, 9, 14]. Major organ involvement is unusual and the lung has been reported as a late complication, often determining a worse outcome .
Recently an ATS working group described idiopathic NSIP as a distinct entity that occurs mostly in middle-aged women who never smoked and who often have positive serologic tests (antinuclear antibodies or rheumatoid factor) .
The typical histological findings of NSIP detected in our patient who also presented the clinical phenotype (middle-aged, non-smoking woman) suggested an additional careful investigation for an accurate rheumatologic evaluation and follow-up.
Kinder et al. recently showed that the majority of patients (88%) who met the UCTD criteria had distinct radiological and pathological features of NSIP, thus emphasizing that this pattern is peculiar of the disease . The same group more recently highlighted the concept that patients with UCTD and lung involvement have improved pulmonary function during the follow-up, as in our case  compared to other unfavourable interstitial diseases as idiopathic pulmonary fibrosis.
Lung involvement usually appears as a complication in established UCTD. There is only a recent study which has demonstrated that NSIP may be the first clinical manifestation of the disease , as in our case. The prospective study by Romagnoli et al. demonstrated that more than 50% of patients diagnosed with NSIP showed an autoimmune disease, as UCTD, in their follow-up. In particular, UCTD was detected in 22% of NSIP patients .
In conclusion, we have described a case of a patient with UCTD whose first clinical manifestation was lung involvement. UCTD should be considered when NSIP is diagnosed even in cases with evident first clinical manifestations of severe respiratory dysfunction.
A multidisciplinary approach with the intervention of pneumologists, radiologists, pathologists and rheumatologists is recommended to achieve a correct 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.
The authors thank Judith Wilson for English revision. This study was supported by the Italian Ministry of Instruction, University and Research.
- Clegg DO, Williams HJ, Singer JZ, Steen VD, Schlegel S, Ziminski C, Alarcón GS, Luggen ME, Polisson RP, Willkens RF: Early undifferentiated connective tissue disease. II. The frequency of circulating antinuclear antibodies in patients with early rheumatic diseases. J Rheumatol. 1991, 18: 1340-1343.PubMedGoogle Scholar
- Danieli MG, Fraticelli P, Salvi A, Gabrielli A, Danieli G: Undifferentiated connective tissue disease: natural history and evolution into definite CTD assessed in 84 patients initially diagnosed as early UCTD. Clin Rheumatol. 1998, 17: 195-201. 10.1007/BF01451046.View ArticlePubMedGoogle Scholar
- Mosca M, Tavoni A, Neri R, Bencivelli W, Bombardieri S: Undifferentiated connective tissue diseases: the clinical and serological profiles of 91 patients followed for at least 1 year. Lupus. 1998, 7: 95-100. 10.1191/096120398678919787.View ArticlePubMedGoogle Scholar
- Mosca M, Neri R, Bombardieri S: Undifferentiated connective tissue diseases (UCTD): a review of the literature and a proposal for preliminary classification criteria. Clin Exp Rheumatol. 1999, 17: 615-620.PubMedGoogle Scholar
- Williams HJ, Alarcon GS, Joks R, Steen VD, Bulpitt K, Clegg DO, Ziminski CM, Luggen ME, St Clair EW, Willkens RF, Yarboro C, Morgan JG, Egger MJ, Ward JR: Early undifferentiated connective tissue disease (CTD). VI. An inception cohort after 10 years: disease remissions and changes in diagnoses in well established and undifferentiated CTD. J Rheumatol. 1999, 26: 816-825.PubMedGoogle Scholar
- Bodolay E, Csiki Z, Szekanecz Z, Ben T, Kiss E, Zeher M, Szücs G, Dankó K, Szegedi G: Five-year follow-up of 665 Hungarian patients with undifferentiated connective tissue diseases (UCTD). Clin Exp Rheumatol. 2003, 21: 313-320.PubMedGoogle Scholar
- Doria A, Mosca M, Gambari PF, Bombardieri S: Defining unclassificable connective tissue diseases: incomplete, undifferentiated, or both?. J Rheumatol. 2005, 32: 213-215.PubMedGoogle Scholar
- Mosca M, Tani C, Neri C, Baldini C, Bombardieri S: Undifferentiated connective tissue diseases (UCTD). Autoimmun Rev. 2006, 6: 1-4. 10.1016/j.autrev.2006.03.004.View ArticlePubMedGoogle Scholar
- Williams HJ, Alarcón GS, Neuner R, Steen VD, Bulpitt K, Clegg DO, Ziminski CM, Luggen ME, Polisson RP, Willkens RF, Yarboro C, Morgan J, Egger MJ, Ward JR: Early undifferentiated connective tissue disease. V. An inception cohort 5 years later: disease remissions and changes in diagnoses in well established and undifferentiated connective tissue diseases. J Rheumatol. 1998, 25: 261-268.PubMedGoogle Scholar
- Kinder BW, Collard HR, Koth L, Daikh DI, Wolters PJ, Elicker B, Jones KD, King TE: Idiopathic nonspecific interstitial pneumonia: lung manifestation of undifferentiated connective tissue disease?. Am J Respir Crit Care Med. 2007, 176: 691-697. 10.1164/rccm.200702-220OC.PubMed CentralView ArticlePubMedGoogle Scholar
- Kinder BW, Shariat C, Collard HR, Koth LL, Wolters PJ, Golden JA, Panos RJ, King TE: Undifferentiated connective tissue disease-associated interstitial lung disease: changes in lung function. Lung. 2010, 188: 143-149. 10.1007/s00408-009-9226-7.PubMed CentralView ArticlePubMedGoogle Scholar
- Suda T, Kono M, Nakamura Y, Enomoto N, Kaida Y, Fujisawa T, Imokawa S, Yasuda K, Hashizume H, Yokomura K, Toyoshima M, Koshimizu N, Suganuma H, Shirai T, Hashimoto D, Inui N, Colby TV, Chida K: Distinct prognosis of idiopathic nonspecific interstitial pneumonia (NSIP) fulfilling criteria for undifferentiated connective tissue disease (UCTD). Respir Med. 2010, 104: 1527-1534. 10.1016/j.rmed.2010.04.022.View ArticlePubMedGoogle Scholar
- Romagnoli M, Nannini C, Piciucchi S, Girelli F, Gurioli C, Casoni G, Ravaglia C, Tomassetti S, Gurioli C, Gavelli G, Carloni A, Dubini A, Cantini F, Chilosi M, Poletti V: Idiopathic NSIP: an interstitial lung disease associated with autoimmune disorders?. Eur Respir J. 2011,Google Scholar
- Vaz CC, Couto M, Medeiros D, Miranda L, Costa J, Nero P, Barros R, Santos MJ, Sousa E, Barcelos A, Inês L: Undifferentiated connective tissue disease: a seven-center cross-sectional study of 184 patients. Clin Rheumatol. 2009, 28: 915-921. 10.1007/s10067-009-1175-2.View ArticlePubMedGoogle Scholar
- Bodolay E, Csiki Z, Szekanecz Z, Ben T, Kiss E, Zeher M, Szücs G, Dankó K, Szegedi G: Five-year follow-up of 665 Hungarian patients with undifferentiated connective tissue disease (UCTD). Clin Rheumatol. 2003, 21: 313-320.Google Scholar
- Travis WD, Hunninghake G, King TE, Lynch DA, Colby TV, Galvin JR, Brown KK, Chung MP, Cordier JF, du Bois RM, Flaherty KR, Franks TJ, Hansell DM, Hartman TE, Kazerooni EA, Kim DS, Kitaichi M, Koyama T, Martinez FJ, Nagai S, Midthun DE, Müller NL, Nicholson AG, Raghu G, Selman M, Wells A: Idiopathic nonspecific interstitial pneumonia: report of an American Thoracic Society project. Am J Respir Crit Care Med. 2008, 177: 1338-1347. 10.1164/rccm.200611-1685OC.View ArticlePubMedGoogle Scholar
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