Two pediatric cases of epidural hematoma in the posterior fossa withextension along the sigmoid sinus groove: MR evaluation

摘要

To discuss the computed tomography (CT) and magnetic resonance (MR) findings ofposterior fossa epidural hematoma (PFEDH) mimicking sinus thrombosis, we presenttwo pediatric cases with the PFEDH extending along the sigmoid sinus grooveevaluated by MR imaging (MRI) and MR venography (MRV). T2-weighted coronal MRIcan diagnose both patency of the sigmoid sinus and epidural hematoma extendingalong the sinus groove. Phase-contrast MRV (PC-MRV) is also useful to evaluatethe flow state in the dural sinuses but it should be diagnosed carefully whetherlow visualization of the dural sinus means only functional flow impairment ororganized occlusion due to thrombus. To avoid an unnecessary anticoagulanttherapy that may worsen epidural hematoma, it is important to recognize thepitfall that PFEDH extending along the sinus groove is easy to misdiagnose for adural sinus thrombosis.