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which range from asymptomatic and incidental&#44; to constitutional symptoms such as fever and weight loss&#44; to cardiological signs and symptoms &#40;including chest pain&#44; ischemia&#44; valve occlusion or dysfunction&#44; arrhythmia or syncope&#41; and even sudden death&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Imaging techniques are of paramount importance for diagnostic and follow-up workflow&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Surgery is the usual therapeutic approach&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Macroscopically&#44; it is often pedunculated and endocardium-based&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> Microscopically&#44; it is composed of spindle cells &#40;fibroblasts and myofibroblasts&#41; showing little or no atypia as well as no or very few mitoses &#40;&#8804;1 per 10 high-power fields&#41;&#44; and inflammatory cells &#40;mostly lympho-histio-plasmocytic&#41;&#44; in a myxoid stroma&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> Specific stains are used to characterize the spindle cells &#40;Masson trichrome&#41; and the stroma &#40;periodic acid-Schiff and Alcian blue for mucinous material and elastic van Gieson to exclude elastic fibers&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Immunohistochemistry can further confirm the diagnosis &#40;vimentin&#44; smooth muscle actin&#44; desmin&#44; calponin and anaplastic lymphoma kinase I &#91;ALK-I&#93; positivity for the spindle cells&#41;&#46; The inflammatory cells may also be marked&#46; If ALK-I is negative &#40;in around 50&#37; of IMTs&#44; apparently with worse prognosis&#41;&#44; genetic tests may be performed&#44; searching for 2p23 locus clonal ALK gene rearrangements&#44; ALK gene fusion with proto-oncogenes and ALK overexpression&#44; among others&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The differential diagnosis is particularly with benign tumors like cardiac fibroma or myxoma&#44; or with malignant neoplasms like sarcomas&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">4</span></a> IMT has an indolent growth&#44; due to its intermediate biological nature&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Mortality has been estimated at 24&#46;6&#37;&#44; with metastasis in 2&#37; and recurrence in 25&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> The underlying factors that lead to the development of IMT are unknown&#44; although multiple theories have been proposed&#44; including fibroblastic-inflammatory reaction to infection&#44; trauma or iatrogenic aggression&#59; autoimmune disease&#59; or neoplastic chromosomal abnormalities&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Apart from incomplete surgical resection&#44; the ongoing pathological stimuli proposed by these etiological theories could explain potential IMT recurrence&#44; the appearance of multiple synchronous or metachronous heart IMTs &#40;in the same or different intracardiac locations&#41; and even the malignant sarcomatous transformation of an IMT&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Regarding the case reported by Dominguez-Massa et al&#46; in this issue of the <span class="elsevierStyleItalic">Journal</span>&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">5</span></a> differentiation from an IMT to an intimal sarcoma in the right atrium&#44; three years after surgery for an IMT in the left atrium&#44; cannot be confirmed&#46; It is known that immunohistochemical positivity for murine double minute 2 &#40;MDM2&#41; with or without fluorescence in-situ hybridization confirmation of amplification of the proto-oncogene <span class="elsevierStyleItalic">MDM2</span> &#8211; relevant in the diagnosis of intimal sarcoma &#8211; may also occur in IMT&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">6</span></a> requiring accurate study in order to find the associated molecular aberration said to be typical of intimal sarcoma&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">7</span></a> This brief overview shows how complex IMT diagnosis can be&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0020" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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Editorial comment
Inflammatory myofibroblastic tumor of the heart: A brief overview
Tumor miofibroblástico inflamatório do coração: breve visão global
Rosa Henriques de Gouveiaa,b
a Histology & Pathology (Medicine), Faculty of Life Sciences, University of Madeira (UMa), Funchal, Madeira, Portugal
b LANA – Clinical and Anatomical Pathology Laboratory, Funchal, Madeira, Portugal
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    "titulosAlternativos" => array:1 [
      "pt" => array:1 [
        "titulo" => "Tumor miofibrobl&#225;stico inflamat&#243;rio do cora&#231;&#227;o&#58; breve vis&#227;o global"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Inflammatory myofibroblastic tumor &#40;IMT&#41; of the heart&#44; also known as inflammatory pseudotumor among other designations&#44; was first reported by Gonzalez-Crussi et al&#46; in 1975&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">1</span></a> It is rare &#40;&#60;5&#37; of primary heart tumors&#41;&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> with 62 cases reported in the international literature by 2021&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> It can affect any age group&#44; but favors young persons&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> Although found in multiple cardiac locations&#44; the atria &#40;particularly the right&#41; are its preferred sites&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> Location and size affect clinical presentation and outcome&#44; which range from asymptomatic and incidental&#44; to constitutional symptoms such as fever and weight loss&#44; to cardiological signs and symptoms &#40;including chest pain&#44; ischemia&#44; valve occlusion or dysfunction&#44; arrhythmia or syncope&#41; and even sudden death&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Imaging techniques are of paramount importance for diagnostic and follow-up workflow&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Surgery is the usual therapeutic approach&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Macroscopically&#44; it is often pedunculated and endocardium-based&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> Microscopically&#44; it is composed of spindle cells &#40;fibroblasts and myofibroblasts&#41; showing little or no atypia as well as no or very few mitoses &#40;&#8804;1 per 10 high-power fields&#41;&#44; and inflammatory cells &#40;mostly lympho-histio-plasmocytic&#41;&#44; in a myxoid stroma&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> Specific stains are used to characterize the spindle cells &#40;Masson trichrome&#41; and the stroma &#40;periodic acid-Schiff and Alcian blue for mucinous material and elastic van Gieson to exclude elastic fibers&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Immunohistochemistry can further confirm the diagnosis &#40;vimentin&#44; smooth muscle actin&#44; desmin&#44; calponin and anaplastic lymphoma kinase I &#91;ALK-I&#93; positivity for the spindle cells&#41;&#46; The inflammatory cells may also be marked&#46; If ALK-I is negative &#40;in around 50&#37; of IMTs&#44; apparently with worse prognosis&#41;&#44; genetic tests may be performed&#44; searching for 2p23 locus clonal ALK gene rearrangements&#44; ALK gene fusion with proto-oncogenes and ALK overexpression&#44; among others&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The differential diagnosis is particularly with benign tumors like cardiac fibroma or myxoma&#44; or with malignant neoplasms like sarcomas&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">4</span></a> IMT has an indolent growth&#44; due to its intermediate biological nature&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Mortality has been estimated at 24&#46;6&#37;&#44; with metastasis in 2&#37; and recurrence in 25&#37;&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> The underlying factors that lead to the development of IMT are unknown&#44; although multiple theories have been proposed&#44; including fibroblastic-inflammatory reaction to infection&#44; trauma or iatrogenic aggression&#59; autoimmune disease&#59; or neoplastic chromosomal abnormalities&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">2&#8211;4</span></a> Apart from incomplete surgical resection&#44; the ongoing pathological stimuli proposed by these etiological theories could explain potential IMT recurrence&#44; the appearance of multiple synchronous or metachronous heart IMTs &#40;in the same or different intracardiac locations&#41; and even the malignant sarcomatous transformation of an IMT&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Regarding the case reported by Dominguez-Massa et al&#46; in this issue of the <span class="elsevierStyleItalic">Journal</span>&#44;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">5</span></a> differentiation from an IMT to an intimal sarcoma in the right atrium&#44; three years after surgery for an IMT in the left atrium&#44; cannot be confirmed&#46; It is known that immunohistochemical positivity for murine double minute 2 &#40;MDM2&#41; with or without fluorescence in-situ hybridization confirmation of amplification of the proto-oncogene <span class="elsevierStyleItalic">MDM2</span> &#8211; relevant in the diagnosis of intimal sarcoma &#8211; may also occur in IMT&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">6</span></a> requiring accurate study in order to find the associated molecular aberration said to be typical of intimal sarcoma&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">7</span></a> This brief overview shows how complex IMT diagnosis can be&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0020" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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