Histopathologic and immunohistochemical features of sea urchin granulomas

Paracentrotus lividus is the most common variety of sea urchin in the west coasts of Spain and has commercial value for the alimentary industry. Puncture with the spine of its rigid external skeleton may cause mechanical injury by skin penetration. It causes immediate local symptoms and, in some cases, a delayed reaction occurs in the site of injury, weeks to months later. In this case, persistent, firm, flesh‐colored papules or nodules develop.

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