IntroductionA case of giant meconium pseudocyst secondary to ileum volvulus perforation is presented. Conventional radiographic features of meconium peritonitis with secondary meconium pseudocyst formation are well described. Our case is unusual in comparison to other cases reported in the literature and needs to be reported because the meconium pseudocyst presented without the typical ultrasound features (calcifications, polyhydramnios and ascites) and was initially identified as an abdominal mass.Case presentationWe describe the case of a 29-year-old Caucasian woman in her third trimester of pregnancy, in which an abdominal mass was detected in the fetus. The newborn was diagnosed in the early neonatal period with meconium pseudocyst secondary to ileum volvulus perforation.ConclusionsThe prenatal appearance of a meconium pseudocyst can be complemented by other signs of bowel obstruction (if present) such as polyhydramnios and fetal bowel dilatation. This is an original case report of interest to all clinicians in the perinatology and fetal ultrasound field. We consider that the utility of this case is the recognition that a meconium pseudocyst might appear without the typical ultrasound features and should be considered as a differential diagnosis when an echogenic intra-abdominal cyst is seen.

The aim of the study was to enhance our understanding of the pathogenesis of the ataxia of Charlevoix-Saguenay, based on the findings presented herein. Five patients with a molecular diagnosis of this disease underwent clinical, radiological, ophthalmologic and electrophysiological examinations. Five novel mutations, which included nonsense and missense variants, were identified, with these resulting in milder phenotypes. In addition to the usual manifestations, a straight dorsal spine was found in every case, and imaging techniques showed loss of the dorsal kyphosis. Cranial MRI demonstrated hypointense linear striations at the pons. Tensor diffusion MRI sequences revealed that these striations corresponded with hyperplastic pontocerebellar fibres, and tractographic sequences showed interrupted pyramidal tracts at the pons. Ocular coherence tomography demonstrated abnormal thickness of the nerve fibre layer. Electrophysiological studies showed nerve conduction abnormalities compatible with a dysmyelinating neuropathy, with signs of chronic denervation in distal muscles. The authors suggest that the hyperplastic pontocerebellar fibres compress the pyramidal tracts at the pons, and that the amount of retinal fibres traversing the optic discs is enlarged. These facts point to the contribution of an abnormal developmental mechanism in the ataxia of Charlevoix-Saguenay. Accordingly, spasticity would be mediated by compression of the pyramidal tracts, neuromuscular symptoms by secondary axonal degeneration superimposed on the peripheral myelinopathy, while the cause of the progressive ataxia remains speculative. The distinctive aspect of the dorsal spine could be of help in the clinical diagnosis.

SUMMARY -Low-grade B cell non-Hodgkin lymphomas typically arise from the marginal zone of the secondary lymphatic follicles. Their intracranial expression is very rare, most frequently affecting the dura mater and the choroid plexus glomi in the lateral ventricles. Their initial evaluation requires the exclusion of more common extra-axial lesions, such as meningiomas, dural metastasis, granulomatous lesions or secondary lymphoproliferative dural extension from body lymphomas. Whenever a ventricular lesion is present, the patient's age and lesion location help narrow the differential diagnosis. Dural-based lymphomas and ventricular/choroid plexus lymphomas are slowgrowing lesions with imaging features similar to meningiomas, which is typically their main dif

We retrospectively reviewed surgical biopsy findings of lesions diagnosed as radial scars (RS) at stereotactic core-needle biopsy (SCNB). RS was diagnosed in 52 of 1415 (3.7%) consecutive mammographically detected lesions that underwent 14-gauge automated SCNB. Subsequent surgical biopsy findings were available for 43 lesions in 41 women constituting the study group. Of these 43 lesions, histopathological analysis of the surgical specimen yielded RS in 27 (63%), RS plus atypical ductal hyperplasia (ADH) in 8 (18%), RS plus carcinoma in five (12%), and only carcinoma in three (7%). Carcinomas underestimated at SCNB (n=8) were two in situ carcinomas, two invasive ductal carcinomas not otherwise specified, and four tubular carcinomas. A statistically significant difference (P=0.02) was found between the mean pathologic size of RS without carcinoma and of RS containing carcinoma. Mammographic features could not be used reliably to predict the presence of carcinoma at excision of lesions diagnosed as RS at SCNB. The results suggest that the diagnosis of RS at 14-gauge SCNB of mammographically detected lesions is an indication for surgical biopsy because of the high prevalence of carcinoma in these lesions.