The second edition of this book is the result of collaborative efforts of pathologists from 9 countries. It is more extensive than the previous edition published in 1977. The basic historical classification of the various categories has been retained since it has gained world-wide popularity. The individual categories have been described in more detail. A number of new entities have been included: placental site trophoblastic tumor, large cell calcifying Sertoli cell tumour, cystic granulosa cell tumour of infancy, mixed germ cell sex cord/gonadal stromal tumour, unclassified, tumor of ovarian epithelial type, testicular lesion of adrenogenital syndrome, and testicular lesion of androgen insensitivity snydrome.