Due to overwhelming response from the readers, the book has been revised keeping in view of the various new requirements. The large number of illustrations has been added to give clear and precise view of the particular disease. We are sure the third edition will be more useful to radiologists, residents, and clinicians in their day-to-day practice and helpful to the clinicians in patient management.

Since the discovery of CT scan, this modality has made its visible impact in diagnostic field. Its role is ever increasing in imaging and is an indispensable modality in today's practice. With the emergence of the slip ring technology and then the multidetector configuration made continuous scan acquisition possible in very short time. The isotropic volumetric data acquired can be used for reconstructing images in various planes and displaying them through selective rendering techniques for maximum diagnostic information. This has remarkably improved the image quality and has opened new avenues in the field of diagnosis. All these advances have raised the expectations of the clinicians in acquiring a diagnosis through computed tomography. The plethora of imaging findings are seen and most of which have a list of differential diagnosis. The stress of establishing the closest diagnosis has evoked the need for a book on differential diagnosis based on CT findings.

We are grateful to our colleagues and friends who gave timely support and stood behind us in our joint endeavor of bringing out this book, which was required keeping in view of the fact that no such book is available in an Indian perspective and wide acceptability of this imaging modality for the diagnosis and staging of the disease.