<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2444-054X</journal-id>
<journal-title><![CDATA[Cirugía y cirujanos]]></journal-title>
<abbrev-journal-title><![CDATA[Cir. cir.]]></abbrev-journal-title>
<issn>2444-054X</issn>
<publisher>
<publisher-name><![CDATA[Academia Mexicana de Cirugía A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2444-054X2022000400543</article-id>
<article-id pub-id-type="doi">10.24875/ciru.21000607</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Neumomediastino y fugas de aire secundarias a COVID-19: manejo expectante vs. invasivo de una complicación infrecuente]]></article-title>
<article-title xml:lang="en"><![CDATA[Pneumomediastinum and air leaks secondary to COVID-19: Expectant vs. invasive management of a rare complication]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Fonseca]]></surname>
<given-names><![CDATA[Arturo Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Martínez]]></surname>
<given-names><![CDATA[Carlos Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Padilla-Santamaría]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Hospital No. 72 Lic. Vicente Santos Guajardo Departamento de Medicina Interna]]></institution>
<addr-line><![CDATA[Tlalnepantla Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana División de Ciencias Biológicas y de la Salud Departamento de Atención a la Salud]]></institution>
<addr-line><![CDATA[Xochimilco Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2022</year>
</pub-date>
<volume>90</volume>
<numero>4</numero>
<fpage>543</fpage>
<lpage>547</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2444-054X2022000400543&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2444-054X2022000400543&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2444-054X2022000400543&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Diversas alteraciones que, por su fisiopatología, son clasificadas en conjunto como «fugas de aire», han sido complicaciones raras de la neumonía por COVID-19. Respecto a la infección por SARS-CoV-2, se plantea el debate de si estas se clasifican como espontáneas o secundarias, ya que los múltiples mecanismos de daño estructural pulmonar que conlleva la COVID-19 condicionan fragilidad pulmonar en corto lapso. Por lo anterior, se expone el caso de una paciente de 36 años con COVID-19 complicada con neumomediastino y enfisema subcutáneo con el objetivo de ilustrar y discutir dichas complicaciones.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Several alterations that, due to their pathophysiology, are collectively classified as &#8220;air leaks&#8221;, have been rare complications of COVID-19 pneumonia. In the context of infection by SARS-CoV-2, the debate arises as to whether these are classified as spontaneous or secondary, since the multiple mechanisms of pulmonary structural damage that COVID-19 entails condition lung fragility in a patient in short time. For the above, we presents the case of a 36-year-old female patient with COVID-19 complicated with pneumomediastinum and subcutaneous emphysema in order to illustrate and discuss these complications.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Infecciones por coronavirus]]></kwd>
<kwd lng="es"><![CDATA[Daño pulmonar]]></kwd>
<kwd lng="es"><![CDATA[Fugas de aire]]></kwd>
<kwd lng="es"><![CDATA[Neumonía]]></kwd>
<kwd lng="es"><![CDATA[Neumomediastino]]></kwd>
<kwd lng="en"><![CDATA[Coronavirus infections]]></kwd>
<kwd lng="en"><![CDATA[Lung injury]]></kwd>
<kwd lng="en"><![CDATA[Air leaks]]></kwd>
<kwd lng="en"><![CDATA[Pneumonia]]></kwd>
<kwd lng="en"><![CDATA[Pneumomediastinum]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Padilla-Santamaría]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[Maya-Franco]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Ferman-Cano]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[COVID-19 en México:panorama epidemiológico]]></article-title>
<source><![CDATA[Rev Cadena Cereb]]></source>
<year>2020</year>
<volume>4</volume>
<page-range>31-42</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[JM]]></given-names>
</name>
<name>
<surname><![CDATA[Parra]]></surname>
<given-names><![CDATA[ML]]></given-names>
</name>
<name>
<surname><![CDATA[Diez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Ossaba]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pneumomediastinum and spontaneous pneumothorax as an extrapulmonary complication of COVID-19 disease]]></article-title>
<source><![CDATA[Emerg Radiol]]></source>
<year>2020</year>
<volume>27</volume>
<page-range>727-30</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Chau]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Ghasem]]></surname>
<given-names><![CDATA[W]]></given-names>
</name>
<name>
<surname><![CDATA[Sohn]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Yaghmour]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Air should not be there:a case of pneumomediastinum and pneumopericardium in COVID-19]]></article-title>
<source><![CDATA[Cureus]]></source>
<year>2020</year>
<volume>12</volume>
</nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sahni]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Verma]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Grullon]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Esquire]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Patel]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Talwar]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous pneumomediastinum:time for consensus]]></article-title>
<source><![CDATA[N Am J Med Sci]]></source>
<year>2013</year>
<volume>5</volume>
<page-range>460-4</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[BP]]></given-names>
</name>
<name>
<surname><![CDATA[Shetty]]></surname>
<given-names><![CDATA[GS]]></given-names>
</name>
<name>
<surname><![CDATA[Vijayan]]></surname>
<given-names><![CDATA[PA]]></given-names>
</name>
<name>
<surname><![CDATA[Gopalakrishna]]></surname>
<given-names><![CDATA[U]]></given-names>
</name>
<name>
<surname><![CDATA[Chandan]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Santini]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Management of pneumomediastinum associated with H1N1 pneumonia:a case report]]></article-title>
<source><![CDATA[J Crit Care Med (Targu Mures)]]></source>
<year>2019</year>
<volume>5</volume>
<page-range>28-33</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Diaz]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Patel]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Sayedy]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Anjum]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[COVID-19 and spontaneous pneumomediastinum:a case series]]></article-title>
<source><![CDATA[Heart Lung]]></source>
<year>2021</year>
<volume>50</volume>
<page-range>202-5</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pooni]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
<name>
<surname><![CDATA[Pandey]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Akbar]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Broadening the differential:pneumomediastinum and COVID-19 infection]]></article-title>
<source><![CDATA[BMJ Case Rep]]></source>
<year>2020</year>
<volume>13</volume>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Su]]></surname>
<given-names><![CDATA[X]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Zheng]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous pneumomediastinum:a probable unusual complication of coronavirus disease 2019 (COVID-19) pneumonia]]></article-title>
<source><![CDATA[Korean J Radiol]]></source>
<year>2020</year>
<volume>21</volume>
<page-range>627-8</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Manna]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Maron]]></surname>
<given-names><![CDATA[SZ]]></given-names>
</name>
<name>
<surname><![CDATA[Cedillo]]></surname>
<given-names><![CDATA[MA]]></given-names>
</name>
<name>
<surname><![CDATA[Voutsinas]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Toussie]]></surname>
<given-names><![CDATA[D]]></given-names>
</name>
<name>
<surname><![CDATA[Finkelstein]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous subcutaneous emphysema and pneumomediastinum in non-intubated patients with COVID-19]]></article-title>
<source><![CDATA[Clin Imaging]]></source>
<year>2020</year>
<volume>67</volume>
<page-range>207-13</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Quincho-López]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Quincho-López]]></surname>
<given-names><![CDATA[DL]]></given-names>
</name>
<name>
<surname><![CDATA[Hurtado-Medina]]></surname>
<given-names><![CDATA[FD]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Case report:pneumothorax and pneumomediastinum as uncommon complications of COVID-19 pneumonia —literature review]]></article-title>
<source><![CDATA[Am J Trop Med Hyg]]></source>
<year>2020</year>
<volume>103</volume>
<page-range>1170-6</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hoffmann]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Kleine-Weber]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
<name>
<surname><![CDATA[Schroeder]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Krüger]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Herrler]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Erichsen]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[SARS-CoV-2 cell entry depends on ACE2 and TMPRSS2 and is blocked by a clinically proven protease inhibitor]]></article-title>
<source><![CDATA[Cell]]></source>
<year>2020</year>
<volume>181</volume>
<page-range>271-80e8</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Eperjesiova]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Hart]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Shokr]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Sinha]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
<name>
<surname><![CDATA[Ferguson]]></surname>
<given-names><![CDATA[GT]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous pneumomediastinum/pneumothorax in patients with COVID-19]]></article-title>
<source><![CDATA[Cureus]]></source>
<year>2020</year>
<volume>12</volume>
</nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[SJ]]></given-names>
</name>
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[JY]]></given-names>
</name>
<name>
<surname><![CDATA[Jung]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[SY]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Clinical manifestations of spontaneous pneumomediastinum]]></article-title>
<source><![CDATA[Korean J Thorac Cardiovasc Surg]]></source>
<year>2016</year>
<volume>49</volume>
<page-range>287-91</page-range></nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kouritas]]></surname>
<given-names><![CDATA[VK]]></given-names>
</name>
<name>
<surname><![CDATA[Papagiannopoulos]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Lazaridis]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Baka]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Mpoukovinas]]></surname>
<given-names><![CDATA[I]]></given-names>
</name>
<name>
<surname><![CDATA[Karavasilis]]></surname>
<given-names><![CDATA[V]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pneumomediastinum]]></article-title>
<source><![CDATA[J Thorac Dis]]></source>
<year>2015</year>
<volume>7</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>44-9</page-range></nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Goldman]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Ketheeswaran]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[H]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[COVID-19-associated pneumomediastinum]]></article-title>
<source><![CDATA[Clin Med (Lond)]]></source>
<year>2020</year>
<volume>20</volume>
<page-range>2</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kaneki]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Kubo]]></surname>
<given-names><![CDATA[K]]></given-names>
</name>
<name>
<surname><![CDATA[Kawashima]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Koizumi]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Sekiguchi]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Sone]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous pneumomediastinum in 33 patients:yield of chest computed tomography for the diagnosis of the mild type]]></article-title>
<source><![CDATA[Respiration]]></source>
<year>2000</year>
<volume>67</volume>
<page-range>408-11</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jolobe]]></surname>
<given-names><![CDATA[OMP]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The implications of covid 19-related pneumomediastinum]]></article-title>
<source><![CDATA[Am J Emerg Med]]></source>
<year>2021</year>
<page-range>46-790</page-range></nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Housman]]></surname>
<given-names><![CDATA[B]]></given-names>
</name>
<name>
<surname><![CDATA[Jacobi]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Carollo]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Nobel]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
<name>
<surname><![CDATA[Eber]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Acquah]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[COVID-19 ventilator barotrauma management:less is more]]></article-title>
<source><![CDATA[Ann Transl Med]]></source>
<year>2020</year>
<volume>8</volume>
<page-range>1575</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hamad]]></surname>
<given-names><![CDATA[AM]]></given-names>
</name>
<name>
<surname><![CDATA[Elmahrouk]]></surname>
<given-names><![CDATA[AF]]></given-names>
</name>
<name>
<surname><![CDATA[Abdulatty]]></surname>
<given-names><![CDATA[OA]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Alveolar air leakage in COVID-19 patients:pneumomediastinum and/or pneumopericardium]]></article-title>
<source><![CDATA[Heart Lung]]></source>
<year>2020</year>
<volume>49</volume>
<page-range>881-2</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>20</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chu]]></surname>
<given-names><![CDATA[CM]]></given-names>
</name>
<name>
<surname><![CDATA[Leung]]></surname>
<given-names><![CDATA[YY]]></given-names>
</name>
<name>
<surname><![CDATA[Hui]]></surname>
<given-names><![CDATA[JY]]></given-names>
</name>
<name>
<surname><![CDATA[Hung]]></surname>
<given-names><![CDATA[IF]]></given-names>
</name>
<name>
<surname><![CDATA[Chan]]></surname>
<given-names><![CDATA[VL]]></given-names>
</name>
<name>
<surname><![CDATA[Leung]]></surname>
<given-names><![CDATA[WS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Spontaneous pneumomediastinum in patients with severe acute respiratory syndrome]]></article-title>
<source><![CDATA[Eur Respir J]]></source>
<year>2004</year>
<volume>23</volume>
<page-range>802-4</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>21</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sethi]]></surname>
<given-names><![CDATA[SM]]></given-names>
</name>
<name>
<surname><![CDATA[Ahmed]]></surname>
<given-names><![CDATA[AS]]></given-names>
</name>
<name>
<surname><![CDATA[Hanif]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
<name>
<surname><![CDATA[Aqeel]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Zubairi]]></surname>
<given-names><![CDATA[ABS]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Subcutaneous emphysema and pneumomediastinum in patients with COVID-19 disease;case series from a tertiary care hospital in Pakistan]]></article-title>
<source><![CDATA[Epidemiol Infect]]></source>
<year>2021</year>
<volume>149</volume>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
