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2</a>&#41;&#46; Signs of intramedullary hematopoiesis and mature adipocytes were observed in the center &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; The lesion was diagnosed as osteonevus of Nanta and the patient was scheduled for regular follow-up&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">Primary cutaneous bone formation has been described in Albright hereditary osteodystrophy&#44; progressive osseous heteroplasia&#44; myositis ossificans progressiva&#44; and osteoma cutis&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a> Secondary cases&#44; in turn&#44; have associated with scars&#44; pyogenic granuloma&#44; epidermal cyst&#44; fibroxanthoma&#44; and lipoma&#44; and there have also been reports at the site of trauma or injection&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#44;4</span></a> Rarer associations include burns&#44; dermabrasion&#44; stasis dermatitis&#44; and cutaneous metastases from breast&#44; bladder&#44; or bronchial cancer&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Benign tumors&#44; and melanocytic nevi in particular&#44; are the most common causes of secondary osteoma formation&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Clinically&#44; osteonevus of Nanta resembles an intradermal nevus&#44; is more common in women&#44;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> and tends to be located in the upper part of the body&#44; in particular the face&#44; suggesting a potential pathogenic role for repeated hair follicle trauma and chronic inflammation&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#44;7</span></a> Lesions with necrosis&#44; bleeding&#44; and tissue regeneration could affect physical and chemical factors&#44; such as calcium and phosphorous ion concentrations&#44; pH&#44; oxygen levels&#44; and enzyme activity&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> These factors could induce a granulomatous reaction&#44; triggering the transformation of mesenchymal cells into osteoblasts and resulting in bone formation&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> The most likely mechanism&#44; however&#44; is fibroblast differentiation &#40;stimulated or not&#41; in bone tissue&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The higher incidence observed in women has also raised the possibility of a pathogenic role for estrogen&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Estrogen would bind to osteoblast surface receptors&#44; triggering the release of cytokines and inhibiting bone resorption and osteoclastic activity&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> Certain cytokines&#44; together with cell adhesion proteins and &#946;-transforming factor in particular&#44; would allow mesenchymal stem cells to differentiate into osteoblasts&#44; initiating ossification&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">Histologic examination of osteonevus of Nanta shows signs of ossification under nevus cells&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Characteristic findings include laminated or globular bone with a central cavity containing adipose tissue&#44; osteoblasts&#44; osteoclasts&#44; blood vessels&#44; and occasionally bone marrow elements&#59; hair follicles are almost invariably observed in the lesions&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;9</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">There is no established management for osteonevus of Nanta&#44; and histologically&#44; the lesion is benign&#46; Culver and Burgdorf&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a> however&#44; did report a case of malignant melanoma arising in an osteonevus of Nanta&#44; leading some authors to advise monitoring of patients&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">We have presented the case of a patient with a nevus and histologic features consistent with osteonevus of Nanta&#46; The lesion was fully excised and the patient is being monitored&#46; No signs of recurrence have been observed&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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        "texto" => "<p id="par0055" class="elsevierStylePara elsevierViewall">We would like to thank Dr&#46; Gabriela Santacruz&#44; Head of the Dermatology Department at Hospital San Francisco de Quito&#44; and the patient for giving us his written consent to publish the photographs that appear in this article&#46;</p>"
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Case and Research Letter
Osteonevus of Nanta: A Rare Skin Condition
Osteonevus de Nanta, un fenómeno cutáneo poco habitual
A.V. Alvaradoa,
Corresponding author
avalvaradomd@gmail.com

Corresponding author.
, J.J. Dávila-Rodrígueza, B. Véleza, M. Montenegro-Zumárragab
a Servicio de Dermatología, Hospital San Francisco de Quito, Quito, Ecuador
b Servicio de Anatomía Patológica, Hospital San Francisco de Quito, Quito, Ecuador
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Osteonevus of Nanta is a rare condition characterized by osseus metaplasia in an intradermal nevus&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> The lesion was first described by Heidesfield in 1908&#44; and in 1911&#44; it was reported in a publication by French dermatologist Andr&#233; Nanta&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Bone formation in the skin is uncommon and can be primary &#40;when there is no evidence of a pre-existing lesion&#41; or secondary to an inflammatory and&#47;or neoplastic process&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Secondary bone formation has been reported in a range of lesions&#44; including pilomatrixoma&#44; basal cell carcinoma&#44; acne&#44; pyogenic granuloma&#44; and dermatofibroma&#46; Ossification of an intradermal nevus&#44; however&#44; is very rare&#46;<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#44;4</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">A 38-year-old man with no remarkable history presented with a hyperpigmented lesion on his left cheek that had grown and become progressively harder with time&#46; Physical examination showed a hard&#44; black nodule that measured 1&#46;5<span class="elsevierStyleHsp" style=""></span>cm in diameter and was not painful on palpation &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The lesion was fully excised and a sample sent for evaluation&#46; Histologic examination showed nests of nevus cells with appropriate maturation in the superficial dermis and&#44; underneath&#44; in the deep dermis&#44; bone marrow trabeculae containing osteocytes &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; Signs of intramedullary hematopoiesis and mature adipocytes were observed in the center &#40;<a class="elsevierStyleCrossRef" href="#fig0015">Fig&#46; 3</a>&#41;&#46; The lesion was diagnosed as osteonevus of Nanta and the patient was scheduled for regular follow-up&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><elsevierMultimedia ident="fig0015"></elsevierMultimedia><p id="par0020" class="elsevierStylePara elsevierViewall">Primary cutaneous bone formation has been described in Albright hereditary osteodystrophy&#44; progressive osseous heteroplasia&#44; myositis ossificans progressiva&#44; and osteoma cutis&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a> Secondary cases&#44; in turn&#44; have associated with scars&#44; pyogenic granuloma&#44; epidermal cyst&#44; fibroxanthoma&#44; and lipoma&#44; and there have also been reports at the site of trauma or injection&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#44;4</span></a> Rarer associations include burns&#44; dermabrasion&#44; stasis dermatitis&#44; and cutaneous metastases from breast&#44; bladder&#44; or bronchial cancer&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a> Benign tumors&#44; and melanocytic nevi in particular&#44; are the most common causes of secondary osteoma formation&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Clinically&#44; osteonevus of Nanta resembles an intradermal nevus&#44; is more common in women&#44;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> and tends to be located in the upper part of the body&#44; in particular the face&#44; suggesting a potential pathogenic role for repeated hair follicle trauma and chronic inflammation&#46;<a class="elsevierStyleCrossRefs" href="#bib0065"><span class="elsevierStyleSup">3&#44;7</span></a> Lesions with necrosis&#44; bleeding&#44; and tissue regeneration could affect physical and chemical factors&#44; such as calcium and phosphorous ion concentrations&#44; pH&#44; oxygen levels&#44; and enzyme activity&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> These factors could induce a granulomatous reaction&#44; triggering the transformation of mesenchymal cells into osteoblasts and resulting in bone formation&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> The most likely mechanism&#44; however&#44; is fibroblast differentiation &#40;stimulated or not&#41; in bone tissue&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The higher incidence observed in women has also raised the possibility of a pathogenic role for estrogen&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a> Estrogen would bind to osteoblast surface receptors&#44; triggering the release of cytokines and inhibiting bone resorption and osteoclastic activity&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> Certain cytokines&#44; together with cell adhesion proteins and &#946;-transforming factor in particular&#44; would allow mesenchymal stem cells to differentiate into osteoblasts&#44; initiating ossification&#46;<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">Histologic examination of osteonevus of Nanta shows signs of ossification under nevus cells&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">3</span></a> Characteristic findings include laminated or globular bone with a central cavity containing adipose tissue&#44; osteoblasts&#44; osteoclasts&#44; blood vessels&#44; and occasionally bone marrow elements&#59; hair follicles are almost invariably observed in the lesions&#46;<a class="elsevierStyleCrossRefs" href="#bib0085"><span class="elsevierStyleSup">7&#44;9</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">There is no established management for osteonevus of Nanta&#44; and histologically&#44; the lesion is benign&#46; Culver and Burgdorf&#44;<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a> however&#44; did report a case of malignant melanoma arising in an osteonevus of Nanta&#44; leading some authors to advise monitoring of patients&#46;</p><p id="par0045" class="elsevierStylePara elsevierViewall">We have presented the case of a patient with a nevus and histologic features consistent with osteonevus of Nanta&#46; The lesion was fully excised and the patient is being monitored&#46; No signs of recurrence have been observed&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Spicule with megakaryocytes and white and red blood cell precursors in the yellow bone marrow&#46; Hematoxylin-eosin&#44; original magnification &#215;10&#46;</p>"
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        "texto" => "<p id="par0055" class="elsevierStylePara elsevierViewall">We would like to thank Dr&#46; Gabriela Santacruz&#44; Head of the Dermatology Department at Hospital San Francisco de Quito&#44; and the patient for giving us his written consent to publish the photographs that appear in this article&#46;</p>"
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Article information
ISSN: 15782190
Original language: English
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