<?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>1816-8949</journal-id>
<journal-title><![CDATA[Anales de la Facultad de Ciencias Médicas (Asunción)]]></journal-title>
<abbrev-journal-title><![CDATA[An. Fac. Cienc. Méd. (Asunción)]]></abbrev-journal-title>
<issn>1816-8949</issn>
<publisher>
<publisher-name><![CDATA[EFACIM. Editorial de la Facultad de Ciencias Médicas - Universidad Nacional de Asunción]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1816-89492025000200042</article-id>
<article-id pub-id-type="doi">10.18004/anales/2025.058.02.42</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Punción aspirativa con aguja fina en pacientes con nódulos tiroideos: caracterización clínica, ecográfica y anatomopatológica por medio de un estudio descriptivo retrospectivo]]></article-title>
<article-title xml:lang="en"><![CDATA[Fine needle aspiration in patients with thyroid nodules: Clinical, ultrasound, and pathological characterization throught a descriptive retrospective study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Benítez]]></surname>
<given-names><![CDATA[Ana Iris]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arce]]></surname>
<given-names><![CDATA[Maura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez]]></surname>
<given-names><![CDATA[Leticia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jara]]></surname>
<given-names><![CDATA[Elías]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vega]]></surname>
<given-names><![CDATA[Rosa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Asunción Facultad de Ciencias Médicas Hospital de Clínicas, Departamento de Endocrinología y Metabolismo.]]></institution>
<addr-line><![CDATA[San Lorenzo ]]></addr-line>
<country>Paraguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2025</year>
</pub-date>
<volume>58</volume>
<numero>2</numero>
<fpage>42</fpage>
<lpage>51</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_arttext&amp;pid=S1816-89492025000200042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_abstract&amp;pid=S1816-89492025000200042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.iics.una.py/scielo.php?script=sci_pdf&amp;pid=S1816-89492025000200042&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio descriptivo, transversal, retrospectivo, analiza las características clínicas, ecográficas y citopatológicas de nódulos tiroideos (NT) en pacientes sometidos a Punción Aspirativa con Aguja Fina (PAAF) en el Hospital de Clínicas. Se evaluaron 290 pacientes y 293 nódulos, se observó que la mayoría de los pacientes eran mujeres (92,8%) con una edad promedio de 50,26 ± 13 años, las características ecográficas de los NT eran: la mayoría sólidos (61,8%), y los hallazgos sugerentes de malignidad fueron: hipoecogenicidad (36,9%), bordes irregulares (22,2%), diámetro anteroposterior mayor al transverso (&#8220;más alto que ancho&#8221;) (15%), microcalcificaciones (13%) y adenomegalias sospechosas (5,8%). Agrupándolos según el riesgo ecográfico de la Asociación Americana de Tiroides (ATA), encontramos 53,6% clasificados como de bajo riesgo de malignidad, 21,2% sospecha intermedia, 19,5% de alta sospecha y 5,8% de muy baja sospecha. La citología fue 32,4% Bethesda 1, 51,5% Bethesda 2, 9,6 % Bethesda 3, 3,1% Bethesda 4, 2% Bethesda 5 y 1,4% Bethesda 6. Al evaluar la relación entre los hallazgos ecográficos y el resultado anatomopatológico, se encontró una tasa de concordancia del 83%, con una sensibilidad del 80% y especificidad del 83,3%, con un valor predictivo negativo (VPN) del 98% y valor predictivo positivo del 30%, hallazgo considerado significativo. Los resultados evidencian una correlación significativa entre los hallazgos ecográficos y los resultados citopatológicos, con una alta tasa de concordancia en la clasificación de NT benignos. Estos datos son esenciales para mejorar la precisión diagnóstica y evitar intervenciones quirúrgicas innecesarias.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This descriptive, cross sectional, retrospective study analyzes the clinical, ultrasound, and cytopathological characteristics of thyroid nodules (NT) in patients undergoing Fine Needle Aspiration (FNA) at the Hospital de Clinicals. A total of 290 patients and 293 nodules were evaluated, and it was observed that most patients were women (92.8%) with a mean age of 50.26 ± 13 years, the ultrasound characteristics of the NTs were: most of them solid (61.8%), and the findings suggestive of malignancy were: hypo echogenicity (36.9%), irregular borders (22.2%) anteroposterior diameter greater than the transverse (higher than wide) (15%), microcalcifications (13%), and suspicious adenomegaly (5.8%). Cluster them according to the ultrasound risk of the American Thyroid Association (ATA), we found 53.6% classified as low risk of malignancy, 21.2% intermediate suspicion, 19.5% high suspicion and 5.8% very low suspicion. Cytology was 32.4% Bethesda 1, 51.5% Bethesda 2, 9.6% Bethesda 3, Bethesda 3, Bethesda 4 3.1%, Bethesda 5 2%, and Bethesda 6 1.4%. When the relationship between the ultrasound findings and the pathological result was evaluated, a concordance rate of 83% was found, with a sensitivity of 80% and specificity of 83.3%, with a negative predictive value (NPV) of 98% and a positive predictive value of 30%, a finding considered significant. The results show a significant correlation between ultrasound findings and cytopathological results, with a high concordance rate in the classification of benign NTs. These data are essential to improve diagnostic accuracy and avoid unnecessary surgical interventions.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Punción aspirativa con aguja fina]]></kwd>
<kwd lng="es"><![CDATA[nódulos tiroideos]]></kwd>
<kwd lng="es"><![CDATA[ecografía]]></kwd>
<kwd lng="es"><![CDATA[Bethesda]]></kwd>
<kwd lng="es"><![CDATA[diagnóstico citológico]]></kwd>
<kwd lng="en"><![CDATA[fine needle aspiration]]></kwd>
<kwd lng="en"><![CDATA[thyriod nodules]]></kwd>
<kwd lng="en"><![CDATA[ultrasound]]></kwd>
<kwd lng="en"><![CDATA[Bethesda]]></kwd>
<kwd lng="en"><![CDATA[cytological diagnosis]]></kwd>
</kwd-group>
</article-meta>
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