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• W2078971255 abstract "BackgroundTargetoid hemosiderotic hemangioma (THH), also called hobnail hemangioma, is a benign vascular lesion and thought to be of lymphatic origin.ObjectiveWe sought to perform a clinicopathologic analysis of cases diagnosed as THH in a tertiary care children’s hospital.MethodsClinical and histopathologic data were obtained from a chart review of 12 confirmed pediatric cases of THH. To determine the presence or absence of lymphatic vessels in lesional biopsy specimens, we evaluated the expression of the lymphatic endothelial cell marker podoplanin using the D2-40 antibody. Wilms tumor-1 gene immunostaining and Ki-67 proliferation index were also performed to evaluate the proliferative nature of these lesions.ResultsThree children had a lesion since birth and 4 had a history of trauma before appearance of the THH. D2-40 immunostaining was positive in every case. Wilms tumor-1 gene immunostaining was negative in 9 cases, focally positive in two cases, and not performed in one case. The Ki-67 proliferation index was very low in all cases studied.LimitationsThe small number of cases and restriction to a pediatric population were limitations.ConclusionOur findings suggest that THH should be classified as a lymphatic vascular malformation. Targetoid hemosiderotic hemangioma (THH), also called hobnail hemangioma, is a benign vascular lesion and thought to be of lymphatic origin. We sought to perform a clinicopathologic analysis of cases diagnosed as THH in a tertiary care children’s hospital. Clinical and histopathologic data were obtained from a chart review of 12 confirmed pediatric cases of THH. To determine the presence or absence of lymphatic vessels in lesional biopsy specimens, we evaluated the expression of the lymphatic endothelial cell marker podoplanin using the D2-40 antibody. Wilms tumor-1 gene immunostaining and Ki-67 proliferation index were also performed to evaluate the proliferative nature of these lesions. Three children had a lesion since birth and 4 had a history of trauma before appearance of the THH. D2-40 immunostaining was positive in every case. Wilms tumor-1 gene immunostaining was negative in 9 cases, focally positive in two cases, and not performed in one case. The Ki-67 proliferation index was very low in all cases studied. The small number of cases and restriction to a pediatric population were limitations. Our findings suggest that THH should be classified as a lymphatic vascular malformation." @default.
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• W2078971255 date "2012-01-01" @default.
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• W2078971255 title "Targetoid hemosiderotic hemangiomas (hobnail hemangiomas) are vascular lymphatic malformations: A study of 12 pediatric cases" @default.
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• W2078971255 doi "https://doi.org/10.1016/j.jaad.2011.05.025" @default.
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