You can download Pathology Illustrated 5th Edition by Peter S. Macfarlane, Robin Reid, Robin Callander and Alasdair D. T. Govan free in pdf format.
This book is written for medical students studying pathology during the second or third year of their program. It has been rewritten to reflect the study of pathology in a modern setting. Information is presented as a series of annotated diagrams. The first seven chapters cover general pathology and the basic principles. The remainder of the book explores the diseases of the various body systems.