Malignant Vascular Neoplasms
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Transcript of Malignant Vascular Neoplasms
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Moritz Kaposi
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Close up of Kaposi's sarcoma on the sole of the feet & toes.
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Nodular stage
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Characteristic purplish hue is seen in multifocal Kaposi's of the palate and gingiva.
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Numerous violet papules & nodules grouped in glans penis
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Visceral involvement with Kaposi's sarcoma in AIDS is common. Here are multiple reddish
nodules seen over the gastric mucosa.
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Patch-stage lesion with the characteristic "PROMONTORY" SIGN (blood vessel with plump
endothelial cells protruding into abnormal dilated vessels) indicated by the arrow.
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Patch stage KS: slit-like vascular spaces in the dermis.
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Plaque stage
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Plaque stage KS: Large numbers of intracellular and extracellular eosinophilic hyaline globules
are visible. The arrows indicate so-called "AUTOLUMINATION", with paranuclear vacuoles
containing erythrocytes.
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KS: characteristically has hyaline globules, as seen here stained with PAS.
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KS: characteristically has deposits of hemosiderin granules and faint, pale pink
hyaline globules, as seen here.
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KS: slit-like vascular spaces in the dermis of the skin with extravasation of RBCs.
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The low power view of KS is cellular dermal nodule
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Nodular KS
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KS Schools of fish
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Nodular KS: A. The dermis is expanded by a solid tumor nodule (H&E).
B. Fascicles of relatively monomorphic spindled cells, with slit-like vascular channels containing RBCs (H&E).
C. The nuclei of the tumor cells demonstrate immuno-reactivity for HHV-8 (LNA-1 immunohistochemical stain).
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CD31
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KS: immunohistochemical stain with antibody to CD34, which stains the
cells forming the vascular slits.
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The antibody to HHV-8 latent nuclear antigen-1 (LNA-1)
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