High signal in cerebrospinal fluid mimicking subarachnoid haemorrhage on FLAIR following acute stroke and intravenous contrast medium.

We describe five cases of high signal in the cerebrospinal fluid (CSF) on fast-FLAIR images 24-48 h after onset of stroke. All the patients had undergone perfusion-weighted MRI within 6 h of the onset of the symptoms. The CSF was far brighter than the cortical gyri. The high signal was diffusely around both cerebral hemispheres in two cases and around one hemisphere in two others; it was focal, around the acute ischaemic lesion, in one. CT was normal in all cases. The CSF high signal was transient, decreasing in extent and intensity with time and resolving completely within 3-6 days. It was not associated with worsening of the clinical state or poor outcome. Our explanation of this phenomena is hypothetical: we speculate that it could be due to disruption of the blood-brain barrier resulting in leakage of protein, gadolinium chelates, or both in to the subarachnoid space. It should not be confused with subarachnoid haemorrhage.

Epithelioid hemangioendothelioma with solitary bone location associated to multiple lung and liver lesions. A case report.

Progressive development of a lobulated osteolytic lesion of the left calcaneus was observed in a 28-year-old woman. The bone tumor was associated with multiple lung nodules and later with a few small nodular liver lesions. A histological and immunochemical diagnosis of epithelioid hemangioendothelioma was obtained by bone tumor resection and thoracoscopic lung biopsy. Imaging aspects are reported with emphasis on its multifocality.