This book describes in detail the use of immunohistochemistry and electron microscopy in the examination and study of a wide range of undifferentiated tumors. Such tumors are described with clinical case examples and the plentiful illustrations serve as a guide to recognition and diagnosis. The organization of the book reflects the diagnostic process, with algorithms and diagnostic panels of antibodies to help the pathologist elucidate the nature of the neoplasm. Coverage ranges from basic aspects of immunohistochemistry and diagnostic electron microscopy to new ways of predicting tumor behavior and prognosis, and the use of RNA and DNA probes. Written by internationally recognized experts.