This book provides a step-by-step and practically applicable approach for the accurate and clinically relevant diagnosis of lymph node (LN) and bone marrow (BM) biopsies. Clinicians expect pathological guidance not only with accurate diagnosis, but also about disease progression, minimal residual disease, disease susceptibility to a particular therapy, effects of prior therapy on prognosis and subsequent therapy etc. This book provides brief but to the point guidance about the prognostic and therapeutic implications of key ancillary studies so that the pathologist is comfortable to answer clinician’s questions over the entire arc of manifestations and management of the disease. The text follows the WHO (2016) classification in essence but the material is organized in a fashion most useful to a practicing surgical pathologist. This is achieved by focusing on the morphological findings as the starting point. Using this morphological “backbone” and several frequently asked questions (FAQs) the reader is guided to a rational list of differential diagnoses leading to a definitive diagnosis. The contents of each chapter are carefully selected so that the practically important and directly applicable information is available in an easy-to-find and easy-to-grasp format.