Aggressive meningioma with jugular vein extension. Case report with ultrastructural observations.

A meningioma that was seen initially as a mass in the upper portion of the neck in a 44-year-old woman was studied by light and electron microscopy. Light microscopy demonstrated that the tumor was within the lumen of the internal jugular vein. Ultrastructural features led to the diagnosis of meningioma. The clinical findings indicate that the tumor arose within the cranial cavity, invaded a venous sinus, and extended down the internal jugular vein into the upper portion of the neck.