This book discusses the diagnosis and treatment of several kidney diseases. For example, nephrotic syndrome is a disease in which the protein permeability of the basement membranes in the renal glomerular capillaries increases. Nephrotic syndrome may occur due to secondary causes or may be idiopathic. Glomerular diseases in children may occur secondary to primary renal involvement or systemic diseases. The clinical picture is classified as nephritic syndrome, rapidly progressive glomerulonephritis, nephrotic syndrome, and isolated proteinuria or hematuria. Primary examinations that help define the clinical picture include a review of signs and symptoms, urine examination, amount of proteinuria, and renal function. A biopsy is performed on patients to determine the underlying disease, and the appropriate treatment is arranged according to this result. This book discusses all these issues and more.