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The preparation of this Fascicle has been possible only because of the help and contributions of many individuals. Firstly, I offer humble thanks to Dr. Kalman Kovacs, who shared his wealth of knowledge with me over many years of training and collaboration, who taught me lessons of critical thought, and who personifies the love of pituitary. Dr. Kovacs and his wife and collaborator, Dr. Eva Horvath, co-authors of the Second Series Fascicle, provided me with a superb model upon which to build.

I owe a debt of gratitude to Dr. William Singer who taught me many secrets about the pituitary, and to Dr. Arthur I. Cohen whose longstanding interest in this fascinating gland has been both academic and personal. The help and support of these two men has allowed me to pursue studies in this field.

Many pathologists, endocrinologists, and neurosurgeons have contributed the material that was used for this work, whether by sending cases for a consultative opinion, or by contributing interesting slides and photographs for this specific purpose. Special thanks are due to Dr. Juan M. Bilbao and Dr. H. P. Higgins (St. Michael's Hospital, Toronto), Dr. Shereen Ezzat, and Dr. Harley S. Smyth (Wellesley Hospital, Toronto), whose contributions of photographs are acknowledged throughout the book, and to Dr. Robyn L. Apel (Brisbane, Australia) and Dr. Elvio Silva (M.D. Anderson Cancer Center, Houston, Texas) who contributed unusual cases for the purpose of illustration. I thank Dr. C. Bergeron, Dr. S. Carpenter, Dr. C. Coire, Dr. J. Deck, Dr. R. Flemming, Dr. G. From, Dr. S. Handy, Dr. R. Josse, Dr. I. MacKenzie, Dr. P. Muller, Dr. S. Nag, Dr. J. Provias and Dr. R. Silver (Toronto, Ontario), Dr. M. Brennan, Dr. M. Dietrich, Dr. T. Draisey, Dr. M. Oxley, Dr. S. Raphael, Dr. A.R. Sellars (Windsor, Ontario), Dr. G. Davidson and Dr. D. Killinger (London, Ontario), Dr. S. Govatsos and Dr. E. Ur (St. John's, Newfoundland), Dr. W. Halliday (Winnipeg, Manitoba), Dr. J.M. Hughes (Cooperstown, New York), Dr. N. Inderadjaja (Kortrijk, Belgium), Dr. J.O.L. Jorgensen (Aarhus, Denmark), Dr. B. Lach (Ottawa, Ontario), Dr. A. Lee (Burlington, Massachusetts), Dr. D.G. Lowe (London, England), Dr. J. Marks (Westmead, NSW, Australia), and Dr. P. Snyder (Philadelphia, Pennsylvania), for contributing cases over the years. As well, students and residents have brought interesting material for teaching rounds; they have taught me many lessons over the years.

Two anonymous reviewers offered detailed comments and suggestions for valuable improvements to the original draft; I thank them for their time, effort, and knowledge.

The technical support of many is also appreciated. Again, it is not possible to name all who have helped, but I must acknowledge the patience of Lily Ramyar who provided the technical expertise behind many of the photographs and electron micrographs in the following pages. The secretarial work of Colette Devlin is also gratefully acknowledged.

This work would not have been possible without the generous support of Dr. Kenneth P. H. Pritzker and the members of the Department of Pathology and Laboratory Medicine of the Mount Sinai Hospital, and Dr. David Murray and the Department of Pathology of St. Michael's Hospital.

Most importantly, I would like to express my deepest appreciation to my partner and best friend, Dr. Shereen Ezzat, for his unwavering support, both intellectual and emotional, that allowed me to complete this formidable task. Sylvia L. Asa