Vascular malformations rarely involve the male genitalia, and even fewer appear as cystic lesions on the penile shaft. We report an uncommon case of spontaneous swelling near the coronal margin of the penis that was found to arise from a vascular malformation. We review the pathologic findings and the literature regarding vascular malformations of the penis and other penile cystic structures that have similar clinical appearance, and discuss treatment options for penile vascular malformations.
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