A case of developmental venous anomaly with transient thrombosis in its central medullary vein

Abstract

　　We report a case of developmental venous anomaly (DVA) with transient thrombosis in its central medullary vein (CMV). An 11-year-old boy was admitted to our hospital with consciousness disturbance and hemiconvulsion. CT scan showed a high-density component with a serpentine configuration in the right temporal lobe. MRI also revealed umbrella-shaped anomalous medullary veins, which indicated DVA on a susceptibility-weighted image. Contrast-enhanced MRI also revealed thrombosis in the CMV of the DVA. Follow-up MRI 5 days after the initial MRI demonstrated recanalization of the thrombosed CMV. His symptoms gradually improved with only hydration therapy and he was discharged without any neurological deficits on day 10. Symptomatic DVA is very rare. However, although the pathogenesis is unclear, DVA can be accompanied by intracerebral hemorrhage. The present case indicated that the impairment of venous return due to thrombosis of the CMV within the DVA may produce symptoms in cases of DVA.