✓ Neurenteric spinal cysts are infrequently occurring dysraphic lesions that are caused by persistent or abnormal communication among neuroectoderm, notochord, and endoderm. They are generally located at the intradural, extramedullary compartment of the low cervical or upper spinal canal. They occur primarily in infants and in young adults in combination with other congenital abnormalities. The authors report on three cases of lower-thoracic and thoracolumbar intramedullary neurenteric cysts that atypically presented in adult patients in whom there was no concomitant malformation. These lesions appear notable for location, clinical presentation, intraoperative findings, and imaging features.

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We report a case of ecchordosis physaliphora, an uncommon benign lesion originating from embryonic notochordal remnants, intradurally located in the prepontine cistern, that unusually presented associated with symptoms. MRI detected and precisely located the small mass. At surgery, a cystic gelatinous nodule was found ventral to the pons, contiguous with the dorsal wall of the clivus via a small pedicle. Histological examination diagnosed the lesion as an ecchordosis physaliphora. Here we focus on the analysis of the neuroradiological aspects that play a crucial role from both a diagnostic and a therapeutic standpoint.

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Current treatments of relapsing-remitting multiple sclerosis (RRMS) with immunosuppressive or immunomodulatory drugs have been shown to modify the course of the disease in a significative number of patients. However, in many cases, the response to either interferon β (IFN-β) or azathioprine (AZA) treatments was not satisfactory and new therapeutic approaches are needed. We studied clinical and MRI efficacy, safety and tolerance of AZA and IFN-β_1a combined therapy in 23 patients with clinically definite RRMS, who had not previously been responsive to either monotherapies. Our cases were divided into three subgroups: 8 previously untreated patients (subgroup A) with at least 2 years of natural course of the disease, 8 patients (subgroup B) previously treated with AZA for 2 years and 7 patients (subgroup C) previously treated with IFN-β_1a for 2 years. The baseline Expanded Disability Status Scale (EDSS) ranged from 2 to 4 in all subgroups. All patients completed 2 years of combined treatment with a dose of AZA adjusted to reduce lymphocyte count down to 1,000 ± 100/µl in association with IFN-β_1a at a dose of 6 MIU every other day. The mean number of relapses during the combined treatment period was significantly lower than that observed before combined therapy in all the three subgroups. Also, the mean ΔEDSS score was significantly lower during combined treatment than in monotherapy in subgroups B and C. Moreover, after 2 years of combined treatment, the number of new T₁ hypointense lesions, the number and volume of proton density/T₂ hyperintense lesions and the gadolinium enhancement of T₁ hypointense lesions were significantly lower than before combined treatment. After 2 years of treatment, this combination therapy appears to be safe and well tolerated and no serious side effects were reported. Despite some limitations of our study design, the information regarding efficacy, safety and tolerance of the association of AZA and IFN-β is most encouraging.

Aim of our study was to evaluate the prevalence of aberrant origin of the branches of the external carotid artery (ECA) in 97 patients by computed tomography (CTA) and magnetic resonance angiography (MRA) and to compare the accuracy of these two techniques in the visualization of the ECA system. All patients underwent CTA and MRA examination of the head and neck. Multiplanar and volumetric reformations were obtained in all cases. For each set of images, the presence of aberrant origin of the branches of the external carotid artery was investigated. MRA and CTA images of each patient were compared to define their information content. Anatomical anomalies were found in 88 heminecks, with a prevalence of 53.3%. In the 61 patients in whom the CTA was performed before the MRA, the latter method showed only 92% of abnormalities detected at the first examination; in the 36 patients in whom MRA was performed first, CTA identified all of the anomalies highlighted by the former, adding 12 new. Knowledge of the anomalies of origin of the ECA branches is essential for the head and neck surgeon; the high prevalence of anomalies found in our series as in the previous studies indicates the opportunity to perform a CTA or a MRA of the head and neck before any surgical or interventional procedure. CTA is the method of choice in the evaluation of anomalies of origin of the branches of the ECA and in the definition of their course.

Subacute cerebral infarcts may appear normal on T2-weighted MRI as an area isointense with surrounding normal tissue. This MRI "fogging effect" has been described in only a few cases. We present a further case of fogging observed during the evolution of a cerebellar infarct.