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

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.