The provided video explains the basic pathology of leukopenia which is described to be a decreased white blood cell count in the blood. Its causes, aetiology, symptoms and management is also explained. TIMELINE: 0:13 Introduction 0:47 What is leukopenia? 1:33 Causes 2:40 Etiology 3:50 Symptoms 4:30 Diagnostic evaluation 5:07 Management