Biopsy pathology of the lymphoreticular system has been written primarily for diagnostic histopathologists although we hope that other workers in the field of lymphoreticular disease will find it of interest and value. With our primary readership in mind we have generously illustrated most sections of the book. Allillustrationsare of haematoxylin and eosin stained sections unless otherwise specified. Conceptual understanding of the histogenesis and interrelationship of non-Hodgkin's Iymphomas has been in a state of turmoil for over a decade. In more recent years immunological and immunocytochemical studies have clarified some problems although in other areas such as the T-celllymphomas histogenetic interrelationships are still far from clear. We are aware, therefore, that in writing this book we have been aiming at a moving target; nevertheless, we feel that the need for such a book, particularly amongst diagnostic histopathologists, outweighs the advan- tage of waiting until all the t's are crossed and all the i's dotted.