Bald nach Erscheinen des Bandes "Geschwulste" "Geschwiilste" 1956 1956 wurde wurde deutlich, deutlich, dass daB dies dies nur ein Anfang gewesen sein konnte. Die grundlegenden Beitrage Beitrage dieses Bandes spiegelten den Wissensstand am Beginn des 6. Jahrzehnts wider. Sie waren wahrscheinlich zugleich die letzten echten Handbuchbeitrage Handbuchbeitrage zu diesem Thema: umfassend und enzyklopadisch enzyklopadisch vollstandig vollstandig und trotzdem als Ganzes lesbar, verfasst verfaBt von den damals besten Sachkennern in Deutschland. Inzwischen hat sich das Handbuch der Allgemeinen Pathologie gewandelt. Entsprechend der Weitung des Faches vergrosserten vergroBerten sich die Themen. Neben den Banden Banden tiber uber die die Organe Organe zum zum Hilfsmechanismus Hilfsmechanismus des des Stoffwechsels, Stoffwechsels, tiber uber die die Zelle, Zelle, das das Altern Altern usw. usw. nahm sich der Geschwulstband vergleichsweise bescheiden aus. Das steht im Gegensatz zur Stellung des Geschwulstproblems in der Allgemeinen Pathologie. Die Krebsforschung erfuhr gerade in den letzten beiden Jahrzehnten einen vorher nicht geahnten Aufschwung, so dass daB eine eine enzyklopadische enzyklopadische Zusammenfassung Zusammenfassung heute heute den den Umfang Umfang des des gesamten gesamten Handbuches Handbuches einnehmen einnehmen wurde wtirde -- wenn wenn sich sich jemand fande, rande, das das zu zu versuchen. versuchen. Und wenn der letzte Band gedruckt ware, ware, ware ware der erste hoffnungslos veraltet."

This second edition updates the "WHO Classification of Endocrine Tumours" proposed in 1980 and incorporates many new tumour entities and pertinent concepts that have developed since that time. It is the result of a collaborative effort between 9 pathologists from different countries, in addition to informal contributions and discussions by many other colleagues. In particular, efforts have been made to integrate into the fundamental backbone of the histologic classification a number of prognostic and functional parameters now essential for appropriate diagnosis and clinicopathologic evaluation of endocrine tumours.

This classification represents a project aimed at bringing together the variety of ways thymic epithelial neoplasms have been classified. It focuses on their growth characteristics, and cytoarchitectural features . The classification, though restricted to the thymic region rather than the mediastinum in general, also covers neuroendocrine, germ cell, lymphoid, and stromal tumours, as well as tumour-like lesions and the neck tumours of thymic or related branchial pouch derivation.

The 1973 WHO classification of bladder tumours anticipated a probable need for eventual revision of the criteria for diagnosing papillary and flat bladder neoplasia. A workshop sponsored by the WHO consisting of pathologists, urologists, cytologists, oncologists and basic scientists interested in bladder tumours addressed this subject, and after a follow- -up meeting sponsored by the International Society of Urological Pathology, the classification and terminology used in this text were agreed upon. A major change is in the introduction of a new category: papillary urothelial neoplasm of low malignant potential. Many of the tumours previously designated as papillary transitional cell carcinoma, grade I now fall into that category. Another major change is in the designation of flat lesions, and this includes a definition of carcinoma in situ. Furthermore, a number of variant forms of urothelials carcinomas are included as well as new entities not recognized when the 1st edition was issued.

Although the histological typing of ovarian tumours is the focus of this volume, other aspects of investigation of a specimen of ovarian tumour are also important. Some of these aspects are mentioned in the text or illustrated. They include tumour grading, which is impor- tantprognostically and therapeutically for certain types ofovarian tu- mour, quantification ofcomponents in mixed tumours and evaluation of the stroma of certain tumours that are associated with endocrine function. Grading methodologies have varied from one tumour type to another and from one group of investigators to another for the same type of tumour. Because a standard internationally recognized grading methodology has not been established, no specific guidance is presented in this volume. Nevertheless, grading by any generally acceptable method should be incorporated in the diagnosis whenever appropriate. The clinical and pathological classification of the extent of tu- mour growth (staging) should be taken into account for the purposes of treatment and prognosis. The TNlV1/FIGO system is therefore in- cluded (p. 45). Histological Classification of Ovarian Tumours 1 Surface Epithelial-Stromal Tumours 1. 1 Serous tumours 1. 1. 1 Benign 1 1. 1. 1. 1 Cystadenoma 8441/0 Papillary cystadenoma 8460/0 1. 1. 1. 2 Surface papilloma ...8461/0 1. 1. 1. 3 Adenofibroma; cystadenofibroma ...9014/0 1. 1. 2 Of borderline malignancy (of low malignant potential) 2 1. 1. 2. 1 Cystic tumour 8442/1 Papillary cystic tumour ...846211 Surface papillary tumour...8463/1 1. 1. 2. 2 1. 1. 2. 3 Adenofibroma; cystadenofibroma 9014/1 1. 1.

This classification is based primarily on the microscopic charac- teristics of tumours and, therefore, is concerned with morpho- logically identifiable cell types and histological patterns, as seen with conventional light microscopy. The term tumours is used synonymously with neoplasm. The phrase tumour-like is applied to lesions which resemble neo- plasms, clinically or morphologically, but do not behave biologi- cally in a neoplastic manner. They are included in this classifica- tion because they give rise to problems in differential diagnosis and because of the unclear borderline between neoplasms and certain non-neoplastic lesions. Synonyms are listed only if they have been used widely, or if they are considered to be helpful to the understanding of the lesion. In such cases, the preferred term is given first, followed by the synonym. Although the emphasis of this classification is on histological typing, in the examination of kidney tumours, consideration should be given to the degree of cellular anaplasia, the extent of local spread, vascular and lymphatic invasion, and the occur- rence of metastasis. The scheme of histological grading suggested here is as fol- lows: Grade I applies to the tumours that have the least degree of cellular anaplasia compatible with a diagnosis of malignancy; . grade II! applies to tumours with the most severe degrees of cel- lular anaplasia; and grade I! applies to those tumours in be- tween. This scheme is applicable to the carcinomas of the renal parenchyma and pelvis.

This book differs from others in the Histological Typing series by including more clinical aspects and by concentrating on cancer and precancer of the oral mucosa rather than attempting to cover all benign and malignant tumors of the oral and oropharyngeal tissue. One main aim is to inform general pathologists of the significance of the clinical features of the various lesions discussed as, on the whole, they may be unfamiliar with this territory. Attention is also drawn to those conditions particular to the oral mucosa that may give rise to appearances which are important in differential diagnoses but can be misleading to the pathologist who does not have detailed knowledge of the tissue involved. The TNM-classification for malignant tumors of the lip and oral cavity is also included.

In this second edition of the Histological Typing of Skin Tumours, the concise format of the first edition has been maintained. The number of tumours described, however, has increased considerably, especially in the melanocytic, adnexal, fibrous tissue and lymphoid neoplasms. Care has been taken to avoid needless subclassification, with the aim of limiting the expansion of categories to those fulfilling demonstrable histological criteria. The commentaries remain succinct whilst including the major diagnostic points, with reference to relevant immunohistochemical features.More than 200 new illustrations are included. Close collaboration with the authors of the AFIP Atlas of Tumor Pathology on Melanocytic and Non-melanocytic Tumours of the Skin ensures a consistent approach to the classification of skin tumors

Although more than 12 years have passed since publication of the first WHO histological classification of central nervous system (CNS) tumours, the changes in this revised edition are not radical. Only one formerly recognized entity has been deleted: the monstrocellular sarcoma, because there is immuno- cytochemical evidence of its astrocytic nature. Several new tumour types have been added: the pleomorphic xanthoastro- cytoma has been generally acknowledged for almost a decade; the neurocytoma has gradually evolved as a clinical-pathological entity; and two new entries, the dysembryoplastic neuroepi- thelial tumour and the desmoplastic infantile ganglioglioma, have only been characterized morphologically during the past few years. We regard the classification as an international standard to facilitate communication and have tried to avoid current con- ceptual controversies. The majority of partiCipants supported inclusion of the term "primitive neuroectodermal tumour" (pNET). However, because of our limited knowledge of the biol- ogy of embryonal CNS tumours, preference was given to use PNET selectively, rather than applying it to all small cell embryo- nal childhood tumours, irrespective of their histological pheno- type. Ependymomas and meningiomas now have new histological SUbtypes. Most of these are not associated with biological behaviour different from the parent tumour type, but their description will aid the practising pathologist to identify and classify these lesions. 2 Introduction Histological Typing Following the philosophy of this WHO series, classification is based primarily on histological assessment of cell types and tis- sue patterns recognized by conventional light microscopy.

This second edition is more extensive and detailed than the previous one - now a reference of two decades standing. New technical methods have increased our understanding of many tumours, and the earlier group of monomorphic adenomas has been separated for easier identification, while clearly defined tumours - even if uncommon - have their own category. With reference to their differences in prognosis and treatment, the various types of carcinomas are now listed separately, and new entities have been adopted. The inclusion of the TNM classification of salivary gland tumours together with the more detailed description of the tumour-like lesions will contribute to an even better understanding.

This revision of the book originally published in 1980 is the result of a collaboration among scientists from 10 countries. The authors include not only pathologists but also a urologist and a basic scientist. The second edition - containing 146 colour photographs - is considerably more extensive than its predecessor. A number of new entities, unrecognized in 1980, are included: prostatic intraepithelial neoplasia, which is commonly associated with carcinoma and may also be seen in a biopsy for elevated PSA; basal cell carcinoma; small cell carcinoma; paracrine-endocrine elements; variants of carcinoma; and stromal sarcoma. The criteria for the diagnosis of carcinoma have been expanded, including the minimal criteria. The Gleason grading system, based on growth pattern, is presented in detail. The WHO grading system, based on nuclear anaplasia and glandular differentiation, is more clearly defined.