Lymphome intravasculaire : à propos de deux observations autopsiques et revue de la littérature

Intravacular large B-cell lymphoma (LIV) is a rare entity individualized in the WHO classification since 2001 as a subtype of extranodal diffuse large B-cell lymphoma. We report two autopsic cases of LIV: a 77-year-old woman presenting with fever, dyspnea, antehypophyseal failure and a 54-year-old man presenting with fever, weight-loss, night-sweats and encephalopathy. They died respectively 10 and 7 months after the beginning of symptoms, without diagnosis. Neither infectious disease nor lymphomatous proliferation had been identified. From these two cases and our literature review, we insist on the importance of histopathological diagnosis on biopsy for this rare pathology which clinical diagnosis remains difficult

Association of RET codon 691 polymorphism in radiation-induced human thyroid tumours with C-cell hyperplasia in peritumoural tissue

The RET proto-oncogene encodes a protein structurally related to transmembrane receptors with an intracellular tyrosine kinase domain. In human thyroid gland, the RET proto-oncogene is normally expressed in parafollicular C-cells. Thyroid C-cell hyperplasia is associated with inherited medullary thyroid carcinomas and is considered as a pre-neoplastic stage of C-cells disease. It has also been observed in thyroid tissues adjacent to follicular and papillary carcinomas. In order to study the relationship between a misfunctioning of the RET proto-oncogene and the presence of C-cell hyperplasia, we compared a series of thyroid glands presenting sporadic or radiation-associated tumours, as well as samples of unrelated normal thyroid tissues, for alteration in exons 10 and 11 of the gene and for the presence or absence of C-cell hyperplasia. Here we report a significantly higher frequency of C-cell hyperplasia present in peritumoural thyroid tissues of radiation-induced epithelial thyroid tumours, than in peritumoural of sporadic thyroid tumours or in control normal thyroid tissues (P=0.001). A G691S RET polymorphism was present with a higher frequency in radiation-induced epithelial thyroid tumours (55%) than in sporadic tumours (20%) and in control normal thyroid tissues (15%). Interestingly, this polymorphism was associated in the majority (88%) of radiation-induced tumours with a C-cell hyperplasia in the peritumoural tissues. Several explanations for this association are discussed

Reconfigurable Operator Based Multimedia Embedded Processor

International audienceImage processing applications need embedded devices that can integrate evolutionary standards or various standards, that is to say devices have to be flexible to implement different algorithms at different times. In other respects these devices are constrained with stringent power requirements as well as high performance. Reconfigurable processor can address these points. However, previous reconfigurable architectures suffer from their interconnect cost and do not meet low power constraints. In this paper preliminary work about the design of a reconfigurable processor based on a coarse-grain granularity tailored for multimedia applications is presented. The architecture is flexible and scalable. Coarse-grain operators can be optimized in term of the function they implement, the data word-length and the parallelism speed-up. The processor is designed to limit interconnection overhead

Merkel Cell Carcinoma of Lymph Node Without Skin Primary Can - and Should - Be Distinguished from Others Metastatic Neuroendocrine Carcinoma

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