Poroid hidradenoma of the scalp in a US Veteran’s Administration (VA) patient

Abstract

Poroid hidradenomas are a rare subtype of hidradenoma. A Veteran’s Administration patient presented with a mobile, cystic scalp lesion. Intraoperatively the mass spontaneously ruptured. We hope clinicians will consider this entity on their differential when treating patients presenting with similar scalp lesions and intraoperative findings.

Giant Poroid Hidradenoma of the Forearm

“…Different types of cells are usually distributed randomly throughout the tumor or concentrated in clusters within the tumor lobules. The cystic component is often large and contains amorphous eosinophilic secretions, reminiscent of the eccrine nature of the tumor [5,6]. Necrosis is frequently observed, appearing strongly eosinophilic at the center of tumor lobules.…”