<?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>1130-0558</journal-id>
<journal-title><![CDATA[Revista Española de Cirugía Oral y Maxilofacial]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Esp Cirug Oral y Maxilofac]]></abbrev-journal-title>
<issn>1130-0558</issn>
<publisher>
<publisher-name><![CDATA[ Sociedad Española de Cirugía Oral y Maxilofacial y de Cabeza y Cuello]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1130-05582020000200008</article-id>
<article-id pub-id-type="doi">10.20986/recom.2020.1074/2019</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hipertrofia maseterina unilateral idiopática]]></article-title>
<article-title xml:lang="en"><![CDATA[Idiopathic unilateral masseteric hypetrophy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosa Valencia]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas Cuéllar]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romo Sanhueza]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Afa">
<institution><![CDATA[,Pontificia Universidad Católica de Chile División de Cirugía Departamento de Cirugía Oncológica y Maxilofacial]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<aff id="Afb">
<institution><![CDATA[,Pontificia Universidad Católica de Chile Centro Odontológico Universidad Católica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>42</volume>
<numero>2</numero>
<fpage>91</fpage>
<lpage>93</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1130-05582020000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1130-05582020000200008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1130-05582020000200008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Paciente de 20 años que presentó aumento de volumen facial izquierdo. Estudiado con ecografía, TAC y biopsia quirúrgica. Se establece el diagnóstico de hipertrofia maseterina unilateral idiopática. La hipertrofia maseterina es un desorden benigno que puede manifestarse de forma unilateral o bilateral, que provoca una asimetría facial, frecuentemente asintomática. Se han propuesto varios tratamientos, siendo la infiltración con toxina botulínica tipo A un tratamiento mínimamente invasivo y eficaz.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT A 20-year-old patient who present an increase in left facial side. Studied with ultrasound, CT scan and surgical biopsy. The diagnosis of idiopathic unilateral masseter hypertrophy was established. Masseter hypertrophy is a benign disorder that can manifest unilaterally or bilaterally, causing facial asymmetry, often asymptomatic. Several treatments have been introduced, such as infiltration with Botulinum toxin type A, a minimally invasive and effective treatment.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hipertrofia maseterina]]></kwd>
<kwd lng="es"><![CDATA[asimetría facial]]></kwd>
<kwd lng="es"><![CDATA[toxina botulínica tipo A]]></kwd>
<kwd lng="en"><![CDATA[Masseteric hypertrophy]]></kwd>
<kwd lng="en"><![CDATA[facial asymmetry]]></kwd>
<kwd lng="en"><![CDATA[botulinum toxin type A]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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