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non-smoker&#44; with a clinical history of arterial hypertension and bronchial asthma&#44; who was admitted to the emergency department with a 1-week history of right scapular pain&#46; Chest X-ray revealed complete right pneumothorax with no other lung abnormalities&#44; so a chest tube was placed and progress was favorable&#46; Thirty days later&#44; he presented a new episode of complete right pneumothorax&#44; so a video-assisted thoracoscopy was performed in the right side&#44; revealing the presence of small apical bullae&#46; These were resected&#44; and mechanical pleural abrasion of the upper third of the hemithorax was performed&#46; The patient progressed favorably and was discharged from hospital three days after the intervention&#46; The histological study results were consistent with emphysematous bullae&#46; Four years later&#44; the patient presented in the emergency department again with left pleuritic pain&#44; and a complete left pneumothorax was diagnosed&#46; Chest CT was performed&#44; revealing pneumothorax and multiple&#44; large bilateral cystic cavities&#44; predominantly in the lung bases &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Given the patient&#39;s history of previously treated contralateral pneumothorax&#44; left video-assisted thoracoscopy was performed&#44; with resection of the apex and mechanical pleural abrasion of the upper third of the hemithorax&#46; Histological study of the resected pulmonary apex found emphysematous bullae&#44; with no other changes&#46; The patient progressed favorably and was discharged from hospital three days later&#46; Two years later he was readmitted with recurrence of complete right pneumothorax&#44; so video-assisted thoracoscopy was performed again&#44; and chemical pleurodesis was applied with 8<span class="elsevierStyleHsp" style=""></span>g of talc&#46; Given the recurrent&#44; bilateral nature of the pneumothorax episodes and the CT image of bilateral cysts&#44; a detailed clinical exploration was performed&#46; Notably&#44; discrete papular skin lesions of microcystic appearance were found on the patient&#39;s forehead&#46; These were biopsied and determined on histology to be fibrofolliculomas&#46; The recurrent bilateral pneumothoraxes&#44; bilateral pulmonary cystic cavities&#44; and fibrofolliculomas of the skin suggested the possibility of BHDS&#44; so a study of peripheral blood for the FLCN gene was performed&#44; as mutations in this gene are associated with the appearance of this syndrome&#46; A change in exon 11 of the FLCN gene in position 1285&#44; consistent with a cytosine deletion&#44; was detected&#46; This alteration involves the introduction of a premature stop codon&#44; resulting in a truncated protein&#46; Because this syndrome is associated with kidney tumors&#44; an abdominal CT was performed&#44; which was normal&#46; The patient has had no recurrence of pneumothorax to date&#46; A more comprehensive histological analysis of the lung tissue obtained during the first two surgical interventions was requested&#46; The new report confirmed that the pulmonary bullae in both the right and apices were surrounded by normal alveolar walls&#44; protruding into the interlobular septa&#46; These histologic features have been described &#40;along with the presence of intracystic septa and profusion of venules in the cystic space&#41; as characteristic of BHDS&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">4</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">BHDS is a rare autosomal dominant genodermatosis characterized mainly by cutaneous fibrofolliculomas and&#47;or trichodiscomas&#44; pulmonary cysts&#44; spontaneous pneumothorax&#44; and kidney tumors&#46; The gene involved in this syndrome&#44; FLCN&#44; encodes folliculin&#44; which is expressed mainly in the skin&#44; kidneys&#44; and lung&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">5</span></a> The main criteria for the diagnosis of BHDS are FLCN mutations on the genetic study&#44; and the presence of skin lesions &#40;fibrofolliculomas or trichodiscomas&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> The most common extracutaneous manifestations are respiratory&#58; up to 80&#37; of BHDS patients have pulmonary cysts which can remain asymptomatic for years&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a> The number and size of the lesions varies from one patient to another&#44; ranging from small cysts to bullae measuring several centimeters&#44; located mainly in the lung bases and in the subpleural region&#46; Larger cyst size and volume have been associated with a greater risk of developing pneumothorax&#46; Approximately 20&#37;&#8211;30&#37; of patients with pulmonary cysts have a history of around two episodes of pneumothorax&#46; Moreover&#44; most patients with a history of pneumothorax have been reported to have multiple pulmonary cysts&#46; The right lung is more often affected&#44; although both lungs may be involved in up to 23&#37; of cases&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">8</span></a> A recent study found that 5&#37;&#8211;10&#37; of spontaneous primary pneumothoraxes may be related with BHDS&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">9</span></a> The pathophysiology of the pulmonary cysts is unknown&#46; The most current theory is the &#8220;stretch hypothesis&#8221;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">10</span></a> which suggests that the cysts may originate from cell&#8211;cell adhesion defects generated by the mutation&#46; Over time&#44; repeated pulmonary expansion &#8220;stretches&#8221; the alveolar spaces&#44; particularly in the regions of the lung with larger changes in alveolar volume&#46; Chest CT is the examination of choice for the diagnosis of lung involvement&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">11&#44;12</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The prevalence of renal tumors in these patients varies from 6&#46;5&#37; to 34&#37;&#44; depending on the study&#44;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a> with a predilection for men and the 20&#8211;55 age group&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">13</span></a> Kidney lesions are usually bilateral and multifocal&#44; with some specific histologic types&#44; five of which are&#58; hybrid forms of oncocytoma and chromophobe renal cell carcinoma &#40;50&#37;&#41;&#44; and pure forms of chromophobe carcinoma &#40;34&#37;&#41;&#44; oncocytoma &#40;5&#37;&#41;&#44; clear cell &#40;3&#37;&#41;&#44; or papillary &#40;2&#37;&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">7&#44;14</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Although some authors have associated BHDS with colon cancer&#44; no specific indication for colonoscopy has been described in these patients&#44; and recommendations are the same as for the general population&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">15</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">In conclusion&#44; a patient who presents with multiple recurrent pneumothoraxes who shows bilateral pulmonary cysts on CT should undergo a dermatological examination to detect accessible skin lesions for biopsy and genetic study&#46; This diagnosis justifies a study of the abdomen&#44; and patients should be monitored for the early detection and treatment of kidney tumors&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Fibla Alfara JJ&#44; Molins L&#243;pez-Rod&#243; L&#44; Hern&#225;ndez Ferr&#225;ndez J&#44; Guirao Montes A&#46; Neumot&#243;rax espont&#225;neos de repetici&#243;n como presentaci&#243;n del s&#237;ndrome de Birt-Hogg-Dub&#233;&#46; Arch Bronconeumol&#46; 2018&#59;54&#58;396&#8211;397&#46;</p>"
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Scientific Letter
Recurrent Spontaneous Pneumothorax as a Manifestation of Birt-Hogg-Dube Syndrome
Neumotórax espontáneos de repetición como presentación del síndrome de Birt-Hogg-Dubé
Juan J. Fibla Alfaraa,
Corresponding author
juanjofibla@gmail.com

Corresponding author.
, Laureano Molins López-Rodóa,b, Jorge Hernández Ferrándeza, Angela Guirao Montesb
a Servicio de Cirugía Torácica, Hospital Universitari Sagrat Cor, Barcelona, Spain
b Servicio de Cirugía Torácica, Hospital Clínic, Barcelona, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Birt-Hogg-Dub&#233; syndrome &#40;BHDS&#41; is a rare clinico-pathological entity&#44; named after the 3 Canadian doctors who first described it in 1977&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">1</span></a> Prevalence is estimated at 1&#47;200<span class="elsevierStyleHsp" style=""></span>000 births&#46; The underlying cause is a mutation located on chromosome 17p11&#46;2 of the FCLN gene that encodes folliculin&#46;<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">2</span></a> It is characterized clinically by the presence of skin lesions&#44; lung cysts that may be associated with recurrent pneumothorax&#44; and kidney tumors&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">3</span></a> We report the case of a patient who was diagnosed with BHDS after presenting multiple recurrent episodes of pneumothorax&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">This was a 35-year-old man&#44; non-smoker&#44; with a clinical history of arterial hypertension and bronchial asthma&#44; who was admitted to the emergency department with a 1-week history of right scapular pain&#46; Chest X-ray revealed complete right pneumothorax with no other lung abnormalities&#44; so a chest tube was placed and progress was favorable&#46; Thirty days later&#44; he presented a new episode of complete right pneumothorax&#44; so a video-assisted thoracoscopy was performed in the right side&#44; revealing the presence of small apical bullae&#46; These were resected&#44; and mechanical pleural abrasion of the upper third of the hemithorax was performed&#46; The patient progressed favorably and was discharged from hospital three days after the intervention&#46; The histological study results were consistent with emphysematous bullae&#46; Four years later&#44; the patient presented in the emergency department again with left pleuritic pain&#44; and a complete left pneumothorax was diagnosed&#46; Chest CT was performed&#44; revealing pneumothorax and multiple&#44; large bilateral cystic cavities&#44; predominantly in the lung bases &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; Given the patient&#39;s history of previously treated contralateral pneumothorax&#44; left video-assisted thoracoscopy was performed&#44; with resection of the apex and mechanical pleural abrasion of the upper third of the hemithorax&#46; Histological study of the resected pulmonary apex found emphysematous bullae&#44; with no other changes&#46; The patient progressed favorably and was discharged from hospital three days later&#46; Two years later he was readmitted with recurrence of complete right pneumothorax&#44; so video-assisted thoracoscopy was performed again&#44; and chemical pleurodesis was applied with 8<span class="elsevierStyleHsp" style=""></span>g of talc&#46; Given the recurrent&#44; bilateral nature of the pneumothorax episodes and the CT image of bilateral cysts&#44; a detailed clinical exploration was performed&#46; Notably&#44; discrete papular skin lesions of microcystic appearance were found on the patient&#39;s forehead&#46; These were biopsied and determined on histology to be fibrofolliculomas&#46; The recurrent bilateral pneumothoraxes&#44; bilateral pulmonary cystic cavities&#44; and fibrofolliculomas of the skin suggested the possibility of BHDS&#44; so a study of peripheral blood for the FLCN gene was performed&#44; as mutations in this gene are associated with the appearance of this syndrome&#46; A change in exon 11 of the FLCN gene in position 1285&#44; consistent with a cytosine deletion&#44; was detected&#46; This alteration involves the introduction of a premature stop codon&#44; resulting in a truncated protein&#46; Because this syndrome is associated with kidney tumors&#44; an abdominal CT was performed&#44; which was normal&#46; The patient has had no recurrence of pneumothorax to date&#46; A more comprehensive histological analysis of the lung tissue obtained during the first two surgical interventions was requested&#46; The new report confirmed that the pulmonary bullae in both the right and apices were surrounded by normal alveolar walls&#44; protruding into the interlobular septa&#46; These histologic features have been described &#40;along with the presence of intracystic septa and profusion of venules in the cystic space&#41; as characteristic of BHDS&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">4</span></a></p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">BHDS is a rare autosomal dominant genodermatosis characterized mainly by cutaneous fibrofolliculomas and&#47;or trichodiscomas&#44; pulmonary cysts&#44; spontaneous pneumothorax&#44; and kidney tumors&#46; The gene involved in this syndrome&#44; FLCN&#44; encodes folliculin&#44; which is expressed mainly in the skin&#44; kidneys&#44; and lung&#46;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">5</span></a> The main criteria for the diagnosis of BHDS are FLCN mutations on the genetic study&#44; and the presence of skin lesions &#40;fibrofolliculomas or trichodiscomas&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0105"><span class="elsevierStyleSup">6</span></a> The most common extracutaneous manifestations are respiratory&#58; up to 80&#37; of BHDS patients have pulmonary cysts which can remain asymptomatic for years&#46;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a> The number and size of the lesions varies from one patient to another&#44; ranging from small cysts to bullae measuring several centimeters&#44; located mainly in the lung bases and in the subpleural region&#46; Larger cyst size and volume have been associated with a greater risk of developing pneumothorax&#46; Approximately 20&#37;&#8211;30&#37; of patients with pulmonary cysts have a history of around two episodes of pneumothorax&#46; Moreover&#44; most patients with a history of pneumothorax have been reported to have multiple pulmonary cysts&#46; The right lung is more often affected&#44; although both lungs may be involved in up to 23&#37; of cases&#46;<a class="elsevierStyleCrossRef" href="#bib0115"><span class="elsevierStyleSup">8</span></a> A recent study found that 5&#37;&#8211;10&#37; of spontaneous primary pneumothoraxes may be related with BHDS&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">9</span></a> The pathophysiology of the pulmonary cysts is unknown&#46; The most current theory is the &#8220;stretch hypothesis&#8221;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">10</span></a> which suggests that the cysts may originate from cell&#8211;cell adhesion defects generated by the mutation&#46; Over time&#44; repeated pulmonary expansion &#8220;stretches&#8221; the alveolar spaces&#44; particularly in the regions of the lung with larger changes in alveolar volume&#46; Chest CT is the examination of choice for the diagnosis of lung involvement&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">11&#44;12</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">The prevalence of renal tumors in these patients varies from 6&#46;5&#37; to 34&#37;&#44; depending on the study&#44;<a class="elsevierStyleCrossRef" href="#bib0110"><span class="elsevierStyleSup">7</span></a> with a predilection for men and the 20&#8211;55 age group&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">13</span></a> Kidney lesions are usually bilateral and multifocal&#44; with some specific histologic types&#44; five of which are&#58; hybrid forms of oncocytoma and chromophobe renal cell carcinoma &#40;50&#37;&#41;&#44; and pure forms of chromophobe carcinoma &#40;34&#37;&#41;&#44; oncocytoma &#40;5&#37;&#41;&#44; clear cell &#40;3&#37;&#41;&#44; or papillary &#40;2&#37;&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">7&#44;14</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Although some authors have associated BHDS with colon cancer&#44; no specific indication for colonoscopy has been described in these patients&#44; and recommendations are the same as for the general population&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">15</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">In conclusion&#44; a patient who presents with multiple recurrent pneumothoraxes who shows bilateral pulmonary cysts on CT should undergo a dermatological examination to detect accessible skin lesions for biopsy and genetic study&#46; This diagnosis justifies a study of the abdomen&#44; and patients should be monitored for the early detection and treatment of kidney tumors&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Fibla Alfara JJ&#44; Molins L&#243;pez-Rod&#243; L&#44; Hern&#225;ndez Ferr&#225;ndez J&#44; Guirao Montes A&#46; Neumot&#243;rax espont&#225;neos de repetici&#243;n como presentaci&#243;n del s&#237;ndrome de Birt-Hogg-Dub&#233;&#46; Arch Bronconeumol&#46; 2018&#59;54&#58;396&#8211;397&#46;</p>"
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Article information
ISSN: 15792129
Original language: English
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