A comprehensive medical disease app that contains the following: 1) Gives the description, etiology, onset, diagnosis, pathophysiology, treatment, and prognosis of common and rare diseases. 2) Provides specific information how to manage the surgical patient’s coexisting disease(s) perioperatively, and what the disease related concerns are. One-time purchase with free updates. This app is equivalent to a 4,000 page book and will always be expanded with frequent updates. Categories: Brain/Neuro Cardiac Hematologic Disorders GI System Endocrine System Liver and Biliary Tract Pediatrics Renal Disease Pulmonary Congenital Heart Disease (coming soon)