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former smoker&#44; who was referred to our department for the study of lung nodules&#44; detected incidentally on a chest X-ray obtained for a preoperative work-up&#46; Fiberoptic bronchoscopy showed no significant changes&#46; Chest computed tomography &#40;CT&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was performed&#44; which revealed 2 lesions of thick irregular morphology with large central cavitation and coarse peripheral calcifications lacking interior content in both apical segments&#44; measuring 45 and 40<span class="elsevierStyleHsp" style=""></span>mm in diameter in the right upper lobe &#40;RUL&#41; and left upper lobe &#40;LUL&#41;&#44; respectively&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">Clinical laboratory testing showed only positive antinuclear antibodies &#40;ANA&#41;&#44; titer 1&#47;160 with a granular pattern&#44; and normal IgG4 levels &#40;53<span class="elsevierStyleHsp" style=""></span>mg&#47;dl&#41;&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Left thoracotomy was performed with a wedge resection of LUL segment 6 and vertex which included a nodular lesion measuring 6<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>3<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>1&#46;7<span class="elsevierStyleHsp" style=""></span>mm&#46; An inflammatory infiltrate with abundant plasma cells &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was observed that was diagnostic for nodular pulmonary disease due to IgG4-deposition disease &#40;the immunohistochemical study expressed abundant IgG with a IgG4&#47;IgG ratio &#62;40&#37;&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Taking into account that the patient remained asymptomatic at all times&#44; and that her IgG4 subclass levels were normal&#44; we decided to continue with clinical and radiological follow-up&#46; After 3 years of follow-up&#44; the patient remains asymptomatic and her radiological lesions are stable&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">IgG4-related disease is a recently described condition that more often affects men &#40;ratio of 1 to 0&#46;7&#41; between 60 to 65 years old&#44; predominantly individuals of Asian race&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It is characterized by raised serum IgG4 and IgG4 infiltration in the affected tissue&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">In 1995&#44; Yoshida et al&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> described a form of chronic pancreatitis and postulated that an autoimmune mechanism was the cause of the pancreatic lesion&#46; However&#44; it was not until 2003 that Kamisawa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> first established the term &#8220;IgG4-related autoimmune disease&#8221; &#40;formerly also known as &#8220;hyper-IgG4 disease&#8221; and &#8220;sclerosing disease&#8221;&#41;&#44; while demonstrating that patients who had autoimmune pancreatitis due to this mechanism could also have extensive lesions in other tissues&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Associated symptoms depend on the organ involved and include abdominal pain &#40;40&#37;&#41;&#44; respiratory symptoms &#40;13&#37;&#41;&#44; pruritus &#40;13&#37;&#41;&#44; and diarrhea &#40;6&#37;&#41;&#46; Constitutional symptoms such as weight loss&#44; fatigue and low-grade fever may occur&#46; In addition&#44; some subjects can be asymptomatic at the time of diagnosis and show abnormalities only in laboratory tests or imaging studies&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Patients with intrathoracic involvement are often asymptomatic&#44; and are typically diagnosed after an incidental finding on an imaging study&#46; Approximately 38&#37; of patients have respiratory symptoms&#44; usually cough and dyspnea on exertion&#46; The most frequent intrathoracic manifestation is the presence of hilar and mediastinal lymphadenopathies &#40;40&#37;&#8211;100&#37;&#41;&#46; The 2 most common forms of pulmonary parenchymal involvement are rounded opacities &#40;nodules or masses&#41; and interstitial lung disease&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Serologically&#44; peripheral eosinophilia is found in 34&#37; of patients&#46; Most patients with intrathoracic involvement have raised IgG4 levels in peripheral blood &#40;&#62;140<span class="elsevierStyleHsp" style=""></span>mg&#47;dl&#41;&#44; but this biomarker is considered to be relatively insensitive and nonspecific for the diagnosis of this disease&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> The usefulness of other immunological markers such as rheumatoid factor or C-reactive protein is limited&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">Information from bronchoalveolar lavage &#40;BAL&#41; in IgG4-related lung disease &#40;predominance of lymphocytes with a normal CD4<span class="elsevierStyleSup">&#43;</span>&#47;CD8<span class="elsevierStyleSup">&#43;</span> ratio&#41; is scant and its role is yet to be defined&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Histopathological findings are needed for the diagnosis of the disease&#46; The specimen of choice is surgical lung biopsy&#44; but transbronchial biopsy can also be helpful&#46; Eosinophilic infiltration in observed the interlobular and peribronchial septa and the presence of granulomas is rare&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> In the lung&#44; collagenized fibrosis and active fibroblast proliferation are more predominant than in autoimmune pancreatitis&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">The diagnosis of IgG4-related disease is&#44; then&#44; based on a combination of histopathological&#44; clinical&#44; serological and radiological characteristics&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0080" class="elsevierStylePara elsevierViewall">Steroid treatment is the modality most often recommended in the literature&#44; and the response of intrathoracic and extrapulmonary lesions is similar&#46; The optimal dose is not known&#44; but most experts recommend oral prednisone at an initial dose of 30 to 40<span class="elsevierStyleHsp" style=""></span>mg&#47;day&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> while 1<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#47;day can be used if progress is slow&#46; These doses must be maintained for 2 to 4 weeks and may be reduced in the case of a good response&#44; but patients must always be closely monitored for possible relapse&#46; The optimal duration of maintenance therapy has not been determined and some patients with pulmonary involvement may not achieve complete resolution of their disease&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Evidence on the use of immunosuppressive therapy other than corticosteroids is scant&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Treatment with rituximab in combination with steroids has shown promising results in retrospective studies&#44; and in an open-label pilot study<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> this combination even demonstrated a favorable disease response&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">The prognosis of this disease depends on several parameters&#44; including factors specific to both the patient and the disease&#46; It must also be borne in mind that disease relapse after the withdrawal of steroids is relatively common&#46;</p></span>"
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Scientific Letter
Cavitary lung nodules associated with IgG4-deposition disease
Nódulos pulmonares cavitados con relación a la enfermedad por depósito de IgG4
Silvia Aguado Ibáñeza,
Corresponding author
s.aguado.ibanez@gmail.com

Corresponding author.
, Luis Arturo Arvelo Castroa, Clara Salas Antónb, Myriam Aguilar Péreza
a Departamento de Neumología, Hospital Universitario Puerta de Hierro-Majadahonda, Majadahonda, Madrid, Spain
b Departamento de Anatomía Patológica, Hospital Universitario Puerta de Hierro-Majadahonda, Majadahonda, Madrid, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">IgG4-related disease is a multisystem disorder characterized by the formation of fibroinflammatory lesions&#44; causing the affected tissues to malfunction&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The 2 main features of this disease are tissue infiltration by IgG4 and raised IgG4 levels in serum&#44; but these phenomena are not present in all patients&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">IgG4-related disease represents a diagnostic challenge as it mimics many other processes&#44; including cancers&#44; infections&#44; and autoimmune diseases&#46; For this reason&#44; in most cases&#44; the affected tissues must be biopsied in order to arrive at a diagnosis&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">We report the case of an asymptomatic 79-year-old woman&#44; former smoker&#44; who was referred to our department for the study of lung nodules&#44; detected incidentally on a chest X-ray obtained for a preoperative work-up&#46; Fiberoptic bronchoscopy showed no significant changes&#46; Chest computed tomography &#40;CT&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was performed&#44; which revealed 2 lesions of thick irregular morphology with large central cavitation and coarse peripheral calcifications lacking interior content in both apical segments&#44; measuring 45 and 40<span class="elsevierStyleHsp" style=""></span>mm in diameter in the right upper lobe &#40;RUL&#41; and left upper lobe &#40;LUL&#41;&#44; respectively&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">Clinical laboratory testing showed only positive antinuclear antibodies &#40;ANA&#41;&#44; titer 1&#47;160 with a granular pattern&#44; and normal IgG4 levels &#40;53<span class="elsevierStyleHsp" style=""></span>mg&#47;dl&#41;&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">Left thoracotomy was performed with a wedge resection of LUL segment 6 and vertex which included a nodular lesion measuring 6<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>3<span class="elsevierStyleHsp" style=""></span>&#215;<span class="elsevierStyleHsp" style=""></span>1&#46;7<span class="elsevierStyleHsp" style=""></span>mm&#46; An inflammatory infiltrate with abundant plasma cells &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41; was observed that was diagnostic for nodular pulmonary disease due to IgG4-deposition disease &#40;the immunohistochemical study expressed abundant IgG with a IgG4&#47;IgG ratio &#62;40&#37;&#41;&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Taking into account that the patient remained asymptomatic at all times&#44; and that her IgG4 subclass levels were normal&#44; we decided to continue with clinical and radiological follow-up&#46; After 3 years of follow-up&#44; the patient remains asymptomatic and her radiological lesions are stable&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">IgG4-related disease is a recently described condition that more often affects men &#40;ratio of 1 to 0&#46;7&#41; between 60 to 65 years old&#44; predominantly individuals of Asian race&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> It is characterized by raised serum IgG4 and IgG4 infiltration in the affected tissue&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">In 1995&#44; Yoshida et al&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a> described a form of chronic pancreatitis and postulated that an autoimmune mechanism was the cause of the pancreatic lesion&#46; However&#44; it was not until 2003 that Kamisawa et al&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> first established the term &#8220;IgG4-related autoimmune disease&#8221; &#40;formerly also known as &#8220;hyper-IgG4 disease&#8221; and &#8220;sclerosing disease&#8221;&#41;&#44; while demonstrating that patients who had autoimmune pancreatitis due to this mechanism could also have extensive lesions in other tissues&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">Associated symptoms depend on the organ involved and include abdominal pain &#40;40&#37;&#41;&#44; respiratory symptoms &#40;13&#37;&#41;&#44; pruritus &#40;13&#37;&#41;&#44; and diarrhea &#40;6&#37;&#41;&#46; Constitutional symptoms such as weight loss&#44; fatigue and low-grade fever may occur&#46; In addition&#44; some subjects can be asymptomatic at the time of diagnosis and show abnormalities only in laboratory tests or imaging studies&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Patients with intrathoracic involvement are often asymptomatic&#44; and are typically diagnosed after an incidental finding on an imaging study&#46; Approximately 38&#37; of patients have respiratory symptoms&#44; usually cough and dyspnea on exertion&#46; The most frequent intrathoracic manifestation is the presence of hilar and mediastinal lymphadenopathies &#40;40&#37;&#8211;100&#37;&#41;&#46; The 2 most common forms of pulmonary parenchymal involvement are rounded opacities &#40;nodules or masses&#41; and interstitial lung disease&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Serologically&#44; peripheral eosinophilia is found in 34&#37; of patients&#46; Most patients with intrathoracic involvement have raised IgG4 levels in peripheral blood &#40;&#62;140<span class="elsevierStyleHsp" style=""></span>mg&#47;dl&#41;&#44; but this biomarker is considered to be relatively insensitive and nonspecific for the diagnosis of this disease&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> The usefulness of other immunological markers such as rheumatoid factor or C-reactive protein is limited&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">Information from bronchoalveolar lavage &#40;BAL&#41; in IgG4-related lung disease &#40;predominance of lymphocytes with a normal CD4<span class="elsevierStyleSup">&#43;</span>&#47;CD8<span class="elsevierStyleSup">&#43;</span> ratio&#41; is scant and its role is yet to be defined&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Histopathological findings are needed for the diagnosis of the disease&#46; The specimen of choice is surgical lung biopsy&#44; but transbronchial biopsy can also be helpful&#46; Eosinophilic infiltration in observed the interlobular and peribronchial septa and the presence of granulomas is rare&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> In the lung&#44; collagenized fibrosis and active fibroblast proliferation are more predominant than in autoimmune pancreatitis&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">The diagnosis of IgG4-related disease is&#44; then&#44; based on a combination of histopathological&#44; clinical&#44; serological and radiological characteristics&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">8</span></a></p><p id="par0080" class="elsevierStylePara elsevierViewall">Steroid treatment is the modality most often recommended in the literature&#44; and the response of intrathoracic and extrapulmonary lesions is similar&#46; The optimal dose is not known&#44; but most experts recommend oral prednisone at an initial dose of 30 to 40<span class="elsevierStyleHsp" style=""></span>mg&#47;day&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> while 1<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#47;day can be used if progress is slow&#46; These doses must be maintained for 2 to 4 weeks and may be reduced in the case of a good response&#44; but patients must always be closely monitored for possible relapse&#46; The optimal duration of maintenance therapy has not been determined and some patients with pulmonary involvement may not achieve complete resolution of their disease&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">Evidence on the use of immunosuppressive therapy other than corticosteroids is scant&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> Treatment with rituximab in combination with steroids has shown promising results in retrospective studies&#44; and in an open-label pilot study<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">10</span></a> this combination even demonstrated a favorable disease response&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">The prognosis of this disease depends on several parameters&#44; including factors specific to both the patient and the disease&#46; It must also be borne in mind that disease relapse after the withdrawal of steroids is relatively common&#46;</p></span>"
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ISSN: 15792129
Original language: English
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