1. Ascites is an accumulation of fluid in the peritoneal cavity that can occur due to conditions like cirrhosis, heart failure, and cancer. 2. Diagnosis involves physical exam findings like flank bulging and shifting dullness as well as paracentesis to analyze fluid characteristics. 3. Treatment depends on the cause, with high SAAG ascites from cirrhosis treated initially with salt restriction and diuretics while malignant ascites may require drainage or shunt procedures.