Organ fascicle

Leiomyomas contain well-organized fascicles and may demonstrate degenerative features such as hyalinization and calcification that are not commonly seen in stromal nodules, which are their main differential diagnosis. Large single leiomyomas that are symptomatic are rare. Leiomyomas should demonstrate virtually no mitotic activity and minimal if any nuclear atypia, with the exception of occasional scattered degenerative nuclei. 

Another electrode type takes into consideration that the nerve fibers are organized in bundles. In the case of SPINE ( slowly penetrating interfascicular nerve electrode ), small silicone pads with platinum foil electrodes inserts incorporated vertically [37] (Fig. 5) or radially into the nerves between the nerve fascicles. 

Comparatively few examples of sarcomatoid thymic carcinoma (STC) have been reported. 499-201 Microscopically, this lesion is characterized by fascicles of fusiform and pleomorphic tumor cells, with little internal organization. Some cases, however, contain limited foci in which cohesive epithelioid cell nests are admixed with... 

FIGURE 48.2 Skeletal muscle is organized in progressively larger filaments, beginning with molecular actin and myosin, arranged as myofibrils. Myofibrils assemble into sarcomeres and myofilaments. Myofilaments are assembled into myofibers, which are organized into the fascicles that form a whole muscle. 

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