The book "Differential Diagnosis in Ultrasound" provides a concise knowledge of the differential diagnosis of a sonographic finding. Ultrasound has been helpful in evaluating clinical problems of chest wall, mediastinum, pleura, etc. Mass adjacent to pleural surface or cardiophrenic angle, unilateral diaphragmatic elevation and bilateral diaphragmatic elevation are defined by ultrasound. Neck lesions that include lesions in the calcification of thyroid and carcinoma, salivary gland, neck masses and cervical lymphadenopathy are described. Generalized increase in liver echogenicity can be attributed to fatty infiltration, cirrhosis and hepatitis. Hepatomas, bull's eye appears as echogenic center surrounded by a hypoechoic rim. Hyperechogenicity and hypoechogenicity, lesions of liver, gall bladder, differential diagnosis of pericholecystic fluid, etc are given. Differential diagnosis of spleen, pancreas, gastrointestinal tract, retroperitoneum, renal, urinary bladder, adrenal gland is highlighted. Peritoneal and mesenteric masses, scrotum, testis and epididymis, prostate, breast, musculoskeletal system, orbit, neonatal and infant brain, neonatal and infant spine and also gynecology and obstetrics are discussed.