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whitish reticular lines&#44; and atypical vessels&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a> Histologic findings are those of a benign epithelial tumor&#44; with a proliferation of keratinocytes with a predominantly scaly appearance or more basaloid foci&#44; interlinking the network of rete ridges associated with mature sebocytes&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The association between sebaceous skin neoplasms and hereditary colorectal cancer&#44; Muir Torre syndrome &#40;MTS&#41;&#44; is controversial&#44; but these tumors are seen in approximately 5&#37; of patients with Lynch syndrome &#40;LS&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">An 83-year-old woman presented with a gluteal RASD unrelated to MTS that was detected during routine follow-up for something else&#46; The lesion was described as a scaly erythematous plaque with well-defined borders &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A and B&#41;&#44; and dermoscopy showed glomeruloid vessels&#46; The tentative diagnosis was Bowen disease &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>C&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">Histologic features were those of an adnexal epithelial tumor&#44; comprising a proliferation of eosinophilic keratinocytes with several foci with a basaloid appearance &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>A&#41; associated with clusters of sebocytes at the base of anastomosing epithelial cords &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>B and C&#41;&#46; This latter finding was much more evident on immunohistochemical staining for androgen receptors &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>D&#41;&#46; The papillary dermis contained several vessels with a reactive appearance&#44; without atypia&#44; and a sparse superficial perivascular mononuclear inflammatory infiltrate&#46; No signs of malignancy were observed&#46; Immunohistochemical studies for DNA mismatch repair proteins with intact nuclear expression were performed for MLH1&#44; MSH2&#44; MSH6&#44; and PMS2 &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>E&#8211;H&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">RASDs are sporadic&#44; slow-growing&#44; and generally solitary benign tumors derived from the skin appendages&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;3&#44;9</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Diagnosis is usually delayed due to a low index of clinical suspicion&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> Clinically&#44; the tumors resemble both benign and malignant skin lesions&#44; and the main entities to consider in the differential diagnosis include seborrheic keratosis&#44; sebaceous adenoma&#44; Bowen disease&#44; and basal cell carcinoma&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Symptoms are linked to size&#44; although RASDs are usually asymptomatic&#46; Integration of clinical and dermoscopic findings can point to a diagnosis&#44; but histologic confirmation is necessary&#46;<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;6</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The most characteristic dermoscopic findings are well-defined yellowish areas&#44; or anastomosing yellowish bundles that histologically correspond to the accumulation of sebocytes at the lower part of the tumor lobules&#46; Reticular hyperpigmentation&#44; corresponding to melanin-laden keratinocytes in histology&#44; is also common&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Histologically&#44; RASD is seen as an epithelial lesion characterized by a proliferation of keratinocytes with elongation of the network of anastomosing epidermal rete ridges associated with sebaceous glands and mature sebaceous ductal structures in the basal layer&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Poorly dilated capillary vessels and a mild mononuclear infiltrate were seen in the papillary dermis&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Histologic differential diagnoses include seborrheic keratosis&#44; which unlike RASD does not have a sebaceous component in the reticular cords&#59; eccrine poroma&#44; which shows a proliferation of poroid and cuticular cells and differs from RASD in that ducts are present and sebaceous differentiation is focal and uncommon&#59; verruca vulgaris&#44; which unlike RADS shows viral cytopathic changes and absence of a sebaceous component&#59; and sebaceous nevus&#44; which shows a distinctive papillomatous epithelial proliferation and has a larger sebaceous&#44; eccrine&#44; and apocrine component&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">A diagnosis of RASD was established following integration of characteristic clinical&#44; dermoscopic&#44; and histopathologic findings&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The first published case of RASD was associated with MTS&#44; which is characterized by the presence of sebaceous tumors and cancers associated with LS &#40;e&#46;g&#46;&#44; cancers of the colon&#44; endometrium&#44; urothelium&#44; and central nervous system&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a> These diseases are caused by mutations in&#44; or less commonly&#44; hypermethylation of DNA mismatch repair genes &#40;MLH1&#44; MSH2&#44; MSH6&#44; and PMS2&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7</span></a> The incidence of LS&#47;MTS in patients with sebaceous tumors ranges from 14&#37; to 50&#37;&#59; sebaceous adenoma is the most common tumor observed&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">Immunohistochemical studies can aid in the diagnosis of LS&#47;MTS&#46; They have a sensitivity of 81&#37;&#8211;85&#37; and a specificity of 48&#37;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7</span></a> and show loss of expression of at least 1 DNA repair protein&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7&#44;10</span></a> The Mayo MTS risk score has also been devised to help identify patients with sebaceous tumors at risk for MTS&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;8</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">It should be recalled that abnormal immunohistochemical findings are not diagnostic for LS and should be interpreted in association with family history and genetic tests&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7&#44;10</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">We have described a case of RASD not associated with MTS&#46; We have also reviewed the diagnostic histopathologic characteristics of this relatively uncommon sebaceous neoplasm&#46; RASD must be differentiated from epithelial tumors with a similar morphology&#44; such as seborrheic keratosis&#44; eccrine poroma&#44; sebaceous nevus&#44; and other sebaceous lesions or lesions with sebaceous differentiation&#46; As RASD is associated with MTS&#44; it is important to always take a complete clinical history&#44; apply the Mayo MTS risk score&#44; and perform immunohistochemical studies to check for risk factors for malignant tumors&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0070" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Reticulated acanthoma with sebaceous differentiation&#46; A&#44; Photomicrograph &#40;hematoxylin&#8211;eosin &#91;H&#8211;E&#93;&#44; original magnification &#215;4&#41;&#46; Neoplastic lesion with an adnexal epithelial appearance characterized by a proliferation of predominant eosinophilic keratinocytes&#46; B&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;10&#41;&#46; Small anastomosed foci with a more basaloid appearance&#46; C&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;40&#41;&#46; Clusters of sebocytes at the base of the anastomosing epithelial cords&#46; D&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for androgen receptors showing an evident sebaceous component&#46; E&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MLH1 with an intact nuclear pattern&#46; F&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH2 with an intact nuclear pattern&#46; G&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH6 with an intact nuclear pattern&#46; H&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for PMS2 with an intact nuclear pattern&#46;</p>"
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Case and Research Letter
Reticulated Acanthoma With Sebaceous Differentiation
Acantoma reticulado con diferenciación sebácea
V.G. Valenciaa,
Autor para correspondencia
vanessagava@hotmail.com

Corresponding author.
, H.C. Pérezb, M.J.V. Manriquec
a Servicio de Dermatopatología, Universidad CES, Medellín, Colombia
b Servicio de Dermatología Oncológica, Instituto Nacional de Cancerología, Universidad Militar Nueva Granada, Bogotá, Colombia
c Servicio de Dermatopatología, Universidad CES, Dermatopatóloga Instituto Nacional de Cancerología, Bogotá, Colombia
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Reticulated acanthoma with sebaceous differentiation&#46; A&#44; Photomicrograph &#40;hematoxylin&#8211;eosin &#91;H&#8211;E&#93;&#44; original magnification &#215;4&#41;&#46; Neoplastic lesion with an adnexal epithelial appearance characterized by a proliferation of predominant eosinophilic keratinocytes&#46; B&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;10&#41;&#46; Small anastomosed foci with a more basaloid appearance&#46; C&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;40&#41;&#46; Clusters of sebocytes at the base of the anastomosing epithelial cords&#46; D&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for androgen receptors showing an evident sebaceous component&#46; E&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MLH1 with an intact nuclear pattern&#46; F&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH2 with an intact nuclear pattern&#46; G&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH6 with an intact nuclear pattern&#46; H&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for PMS2 with an intact nuclear pattern&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Reticulated acanthoma with sebaceous differentiation &#40;RASD&#41; is a benign adnexal tumor first described by Ackerman et al&#46; in 1998&#46;<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#8211;3</span></a> Its incidence is unknown and it usually appears in the seventh decade of life&#44; with a slight male predominance and a predilection for the trunk&#44; head&#44; and neck&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Clinically&#44; it presents as yellowish&#44; brownish&#44; or reddish papules or plaques&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a> Dermoscopy usually shows a multicomponent pattern with bright yellowish anastomosing curvilinear structures or well-defined yellowish structures&#44; with or without pigmented reticular lines&#44; whitish reticular lines&#44; and atypical vessels&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a> Histologic findings are those of a benign epithelial tumor&#44; with a proliferation of keratinocytes with a predominantly scaly appearance or more basaloid foci&#44; interlinking the network of rete ridges associated with mature sebocytes&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The association between sebaceous skin neoplasms and hereditary colorectal cancer&#44; Muir Torre syndrome &#40;MTS&#41;&#44; is controversial&#44; but these tumors are seen in approximately 5&#37; of patients with Lynch syndrome &#40;LS&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">An 83-year-old woman presented with a gluteal RASD unrelated to MTS that was detected during routine follow-up for something else&#46; The lesion was described as a scaly erythematous plaque with well-defined borders &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A and B&#41;&#44; and dermoscopy showed glomeruloid vessels&#46; The tentative diagnosis was Bowen disease &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>C&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">Histologic features were those of an adnexal epithelial tumor&#44; comprising a proliferation of eosinophilic keratinocytes with several foci with a basaloid appearance &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>A&#41; associated with clusters of sebocytes at the base of anastomosing epithelial cords &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>B and C&#41;&#46; This latter finding was much more evident on immunohistochemical staining for androgen receptors &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>D&#41;&#46; The papillary dermis contained several vessels with a reactive appearance&#44; without atypia&#44; and a sparse superficial perivascular mononuclear inflammatory infiltrate&#46; No signs of malignancy were observed&#46; Immunohistochemical studies for DNA mismatch repair proteins with intact nuclear expression were performed for MLH1&#44; MSH2&#44; MSH6&#44; and PMS2 &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>E&#8211;H&#41;&#46;</p><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0025" class="elsevierStylePara elsevierViewall">RASDs are sporadic&#44; slow-growing&#44; and generally solitary benign tumors derived from the skin appendages&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#44;3&#44;9</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Diagnosis is usually delayed due to a low index of clinical suspicion&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a> Clinically&#44; the tumors resemble both benign and malignant skin lesions&#44; and the main entities to consider in the differential diagnosis include seborrheic keratosis&#44; sebaceous adenoma&#44; Bowen disease&#44; and basal cell carcinoma&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Symptoms are linked to size&#44; although RASDs are usually asymptomatic&#46; Integration of clinical and dermoscopic findings can point to a diagnosis&#44; but histologic confirmation is necessary&#46;<a class="elsevierStyleCrossRefs" href="#bib0075"><span class="elsevierStyleSup">5&#44;6</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The most characteristic dermoscopic findings are well-defined yellowish areas&#44; or anastomosing yellowish bundles that histologically correspond to the accumulation of sebocytes at the lower part of the tumor lobules&#46; Reticular hyperpigmentation&#44; corresponding to melanin-laden keratinocytes in histology&#44; is also common&#46;<a class="elsevierStyleCrossRefs" href="#bib0070"><span class="elsevierStyleSup">4&#44;5</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">Histologically&#44; RASD is seen as an epithelial lesion characterized by a proliferation of keratinocytes with elongation of the network of anastomosing epidermal rete ridges associated with sebaceous glands and mature sebaceous ductal structures in the basal layer&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Poorly dilated capillary vessels and a mild mononuclear infiltrate were seen in the papillary dermis&#46;<a class="elsevierStyleCrossRefs" href="#bib0060"><span class="elsevierStyleSup">2&#8211;4</span></a> Histologic differential diagnoses include seborrheic keratosis&#44; which unlike RASD does not have a sebaceous component in the reticular cords&#59; eccrine poroma&#44; which shows a proliferation of poroid and cuticular cells and differs from RASD in that ducts are present and sebaceous differentiation is focal and uncommon&#59; verruca vulgaris&#44; which unlike RADS shows viral cytopathic changes and absence of a sebaceous component&#59; and sebaceous nevus&#44; which shows a distinctive papillomatous epithelial proliferation and has a larger sebaceous&#44; eccrine&#44; and apocrine component&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">A diagnosis of RASD was established following integration of characteristic clinical&#44; dermoscopic&#44; and histopathologic findings&#46;</p><p id="par0050" class="elsevierStylePara elsevierViewall">The first published case of RASD was associated with MTS&#44; which is characterized by the presence of sebaceous tumors and cancers associated with LS &#40;e&#46;g&#46;&#44; cancers of the colon&#44; endometrium&#44; urothelium&#44; and central nervous system&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a> These diseases are caused by mutations in&#44; or less commonly&#44; hypermethylation of DNA mismatch repair genes &#40;MLH1&#44; MSH2&#44; MSH6&#44; and PMS2&#41;&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7</span></a> The incidence of LS&#47;MTS in patients with sebaceous tumors ranges from 14&#37; to 50&#37;&#59; sebaceous adenoma is the most common tumor observed&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">Immunohistochemical studies can aid in the diagnosis of LS&#47;MTS&#46; They have a sensitivity of 81&#37;&#8211;85&#37; and a specificity of 48&#37;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7</span></a> and show loss of expression of at least 1 DNA repair protein&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7&#44;10</span></a> The Mayo MTS risk score has also been devised to help identify patients with sebaceous tumors at risk for MTS&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;8</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">It should be recalled that abnormal immunohistochemical findings are not diagnostic for LS and should be interpreted in association with family history and genetic tests&#46;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#44;7&#44;10</span></a></p><p id="par0065" class="elsevierStylePara elsevierViewall">We have described a case of RASD not associated with MTS&#46; We have also reviewed the diagnostic histopathologic characteristics of this relatively uncommon sebaceous neoplasm&#46; RASD must be differentiated from epithelial tumors with a similar morphology&#44; such as seborrheic keratosis&#44; eccrine poroma&#44; sebaceous nevus&#44; and other sebaceous lesions or lesions with sebaceous differentiation&#46; As RASD is associated with MTS&#44; it is important to always take a complete clinical history&#44; apply the Mayo MTS risk score&#44; and perform immunohistochemical studies to check for risk factors for malignant tumors&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0070" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "en" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Reticulated acanthoma with sebaceous differentiation&#46; A&#44; Photomicrograph &#40;hematoxylin&#8211;eosin &#91;H&#8211;E&#93;&#44; original magnification &#215;4&#41;&#46; Neoplastic lesion with an adnexal epithelial appearance characterized by a proliferation of predominant eosinophilic keratinocytes&#46; B&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;10&#41;&#46; Small anastomosed foci with a more basaloid appearance&#46; C&#44; Photomicrograph &#40;H&#8211;E&#44; original magnification &#215;40&#41;&#46; Clusters of sebocytes at the base of the anastomosing epithelial cords&#46; D&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for androgen receptors showing an evident sebaceous component&#46; E&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MLH1 with an intact nuclear pattern&#46; F&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH2 with an intact nuclear pattern&#46; G&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for MSH6 with an intact nuclear pattern&#46; H&#44; Photomicrograph &#40;original magnification &#215;10&#41;&#46; Immunohistochemical staining for PMS2 with an intact nuclear pattern&#46;</p>"
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