Keratoacanthoma. Light micrograph of a section through a keratoacanthoma nodule. The cause of these lesions is unknown but they have many features of a viral condition. A localised proliferation of squamous cells (light pink) have produced the nodule, with a central crater containing a mass of keratin (dark pink). The peripheral epidermis is normal and the dermis shows a chronic, heavy infiltration of inflammatory cells.

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TOP06660739

Source:

達志影像

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RM

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須由TPG 完整授權

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