Scalp arteriovenous malformation draining into the superior sagittal sinus associated with an intracranial arteriovenous malformation: Just a coincidence? Case report

OBJECTIVE AND IMPORTANCE: Recent experimental and clinical evidence suggests 1 that hemodynamic changes in the venous system can induce the formation of new ateriovenous malformations (AVMs). In a rat model, increased venous pressure induces the formation of soft tissue and dural AVMs. We report a clinical observation that may support these data. CLINICAL PRESENTATION: A 4-year-old boy with a midline scalp AVM draining into the superior sagittal sinus had an associated. intracranial/parenchymal AVM : The cerebral AVM increased venous. pressure in the superior sagittal sinus as revealed by angiography. INTERVENTION: The scalp AVM,was resected, and the intracranial AVM was treated by use of the gamma knife. CONCLUSION: On the basis of reported experimental data and the morphological and hemodynamic characteristics in this patient's two lesions, we suggest that scalp AVM might have been induced by hypertension in the superior saigittal sinus. This clinical observation supports the notion suggested by experimental studies that, hemodynamic changes can induce the formation of associated AVMs.