the primitive neuroectodermal tumor (pnet) belongs to a group of highly malignant tumors and is composed of small round cells of a neuroectodermal origin. categorized in the same tumor family as ewing sarcoma, the pnet is most likely to occur in bones and soft tissues. however, a small number of pnet cases arising in the pelvis have been reported as well. we present three cases of pelvic pnet: ...

IT was Sir Winston Churchill who remarked in 1944, when addressing the Royal College of Physicians, that "the longer you can look back, the further you can look forward." Probably in no field is this more true than in the biological sciences. An understanding of their evolution in a historical sense at once provides a perspective and a background to knowledge which illuminates the path to furth...

This paper concerns the prefix-primitive (shortly, p-primitive) conjugates of related primitive words. The non-p-primitive conjugates of square-free words are studied. We show that every d-primitive square-free word over an alphabet with three elements has at most one non-p-primitive conjugate. We also find that all the conjugates of a primitive word are nor p-primitive.

the radiology diagnosis of primary hydatid disease of the kidney is possible when a renal mass is noted on the radiograph. part icula rly in the countries where this disease is prevalent. cha racteristic radiological signs, hydatiduria, eosinophili and specific examination such as casoni and weinberg tests are a ll helpful to assist the diagnosis. twelve cases of primary hydatid disease of the ...

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