Acquired port-wine stain related to acoustic neuroma

Summary Port‐wine stains are frequently seen congenital vascular malformations consisting of ectatic dermal capillaries. Acquired port‐wine stain that develops later in life is an uncommon vascular lesion that is morphologically identical to a congenital port‐wine stain. In the majority of acquired port‐wine stains, the aetiology is unknown, but trauma is an important causative factor. Other proposed aetiologies include chronic sun exposure, hormonal changes, frostbite injury, obstruction of the peritoneovenous shunt, herpes zoster infection, and cerebral arteriovenous malformation. Here we report the first case of a patient who had an acquired port‐wine stain related to a solid brain tumour.