During the last few years the annual scientific meeting of the American Institute of Ultrasound in Medicine has become one of the largest and most important of the yearly meetings in the field of diagnostic ultrasound. At these meetings papers are presented de­ scribing the latest developments in this field allover the North American continent. The decision of the Executive Board of the American Institute of Ultrasound in Medicine to publish the manu­ scripts presented at its annual scientific meetings will therefore be welcomed both by workers in the field who are unable to attend the meetings, but nevertheless wish to follow the latest develop­ ments in their field of interest, and also by members of the Insti­ tute who will wish to be able to refer later to details in papers of interest. It will be our endeavour to ensure that these Annual Proceedings will be in the hands of subscribers no later than four months after the meeting reported. It is hoped that such prompt publication will further enhance their value to those interested in the field of ultrasound in medicine and biology. The Editor gratefully acknowledges the assistance of his secre­ tary, Mrs. Joan Carson, upon whose shoulders fell the burden of re­ typing all the manuscripts in this volume presented in abstract form and who played an invaluable part in the compilation of all the text for photographic printing. D. N.

Cardiology.- Abnormal Motion of Interventricular Septum of Patients with Prosthetic Valve.- Echocardiographic Studies of the Tricuspid Valve in Atrial Septal Defect.- Echocardiographic Diagnosis of Complete Atrioventricular Canal Defect.- Ultrasonic Appearance of a Coronary Arteriovenous Communication.- Right Ventricular Volume Overload Caused by "Aorta" to Right Heart Shunt: Echocardiographic Observations.- Use of Ultrasound to Define Shunting in Ventricular Septal Defects.- Calcified Intra-Atrial Mass Detected by M-Mode Echocardiography and Multi-Head Transducer Scanning: A Case Report.- Correlation of Echocardiographic and Angiographic Abnormalities in Mitral Valve Prolapse.- Intraoperative Assessment of Mitral Commissurotomy and Mitral Valve Replacement by Echocardiography.- Evaluation of the Björk-Shiley Prosthetic Valve by Echocardiography.- Intracavitary Echoes in Patients with Mitral Prosthetic Valves.- Echocardiographic Identification of the Intra-Atrial Baffle Following Surgery in Transposition of the Great Vessels.- Cross-Sectional Echocardiographic Features of Ebstein's Malformation.- Echocardiographic Correlates of the Second Heart Sound.- Echo Distinction of Left-To-Right Shunts from Non-Structural Heart Disease (NHD) in Infancy.- Echocardiography in Congential Left Ventricular-Right Shunt.- Limitations of Quantitative Determination of Left Ventricular Volume by Multiscan Echocardiography.- Usefulness of Biaxial Left Atrial Dimension Measurements by Echocardiography.- Serial Echocardiographic Measurement of Left Ventricular Dimensions During Subacute and Acute Circulatory Stress.- Oscillations of the Interventricular Septum in Aortic Insufficiency.- Echocardiographic Features of Subpulmonic Obstruction in Transposition of the Great Vessels.- Echocardiographic Measurements in Normal Well Children.- The Thick Septum: Echocardiographic Differentiation of Its Causes.- A Prospective 2-1/2 Year Experience with Echocardiographic Evaluation of Prematures with Patient Ductus Arteriosus.- The Value of Echocardiography in Congestive Cardiomyopathy in Children.- Non-Invasive Right and Left Systolic Time Intervals by Echocardiography.- Echocardiographic Differentiation of Infundibular from Valvular Pulmonic Stenosis.- Echocardiographic Pattern of Pulmonic Valve Motion with Pulmonary Hypertension.- Diagnosis of Tricuspid Valve Prolapse by Echocardiography.- Echocardiographic Diagnosis of Mitral Apparatus Dysfunction with Mitral Insufficiency.- Normal Posterior Mitral Leaflet Motion in Mitral Stenosis.- Echocardiography Findings in Patients with Mitral Valve Prolapse Mimicking Left Atrial Tumor.- Echocardiographic Evaluation of Mitral Valve Tissues Bioprostheses In Vitro and In Vivo.- Noninvasive Assessment of Prosthetic Mitral Valve Function.- In Vitro Prosthetic Valve Studies Utilizing Echocardiography.- Effects on Abnormal Septal Motion of Surgery for Constrictive Pericarditis.- Objective Assessment of the Role of Echocardiography (UCG) in the Diagnosis of Acute Endocarditis (AE).- Acquired Paradoxic Septal Motion Following Successful Coronary Artery Bypass Surgery.- Cross-Sectional Echocardiographic Localization of the Sites of Left Ventricular Outflow Tract Obstruction (LVOTO).- Echocardiographic Features of Infiltrative Cardiomyopathy.- The Echocardiographic Spectrum in Hypertrophic Cardiomyopathy.- Abdominal Disease.- Internal Echographic Patterns of Abdominal Masses.- The Role of Ultrasound in Pediatrics.- Grey Scale Ultrasonography in the Differential Diagnosis of Obstructive Jaundice.- Ultrasonic Visualization of the Abdominal Aorta.- Ultrasonic Evaluation of Pancreatitis.- Prostate Localization Using Ultrasound B-Mode Scanning.- Comparison of Radioisotope and Ultrasound Examination in the Investigation of Hepatobiliary Disease.- B-Mode Ultrasonographic Study of Diaphragmatic Motion.- Percutaneous Aspiration of Abscesses with Ultrasound.- Diagnostic Accuracy of Abdominal Scanning.- The Accuracy of Diagnostic Ultrasound in Detecting Retroperitoneal Lymph Node Enlargement in Malignant Lymphona and Hodgkin's Disease.- The Value of Ultrasonic Scanning in the Diagnosis of Intra-Abdominal Abscesses and Hematomas.- Ultrasound and Radioisotope Imaging in Abdominal Disease.- Renal Angiomyolipoma: Ultrasound Differentiation.- Ultrasonography of the Gall Bladder in Jaundiced Patients.- The Valuable Contribution of Diagnostic Ultrasound in the Preoperative Diagnosis of Splenic Cysts.- Ultrasonic Scanning in the Diagnosis of Adrenal Tumors.- Ultrasonically Guided Fine Needle Biopsy of the Pancreas.- B-Mode Ultrasonographic Examination of Testes.- Torsion of the Testis Diagnosed by Ultrasound.- Demonstration of the Normal Pancreas with Gray Scale Ultrasound.- Diagnostic Ultrasound in the Demonstration of Pancreatic Lesions.- Accuracy in Pancreatic Sonography - A Review of 150 Patients.- Combined Ultrasonic and Radionuclide Approach to Biliary-Pancreatic Disease Diagnosis.- Demonstration of Dilated Common Bile Duct.- Ultrasonic Reduction of Mitotic Activity in Regenerating Rat Liver.- Ultrasonic Determination of Renal Transplant Volume.- Obstetrics & Gynecology.- Ultrasound in Prenatal Genetic Diagnosis.- Use of Ultrasound in Therapeutic Abortion.- Ultrasound in the Evaluation and Diagnosis of Ovarian Tumors.- Simultaneous A- and B-Scan Ultrasound Guidance of Aspiration Needles During Amniocentesis in Early Second Trimester for Prenatal Genetic Disease Detection - A Preliminary Report.- Ultrasonic Localization of "Missing I.U.C.D.'s".- Ultrasonic Visualization of Pelvic Radium Applications.- Comparison of Pelvic Pneumography and Echography for Stein-Levinthal Syndrome.- In Utero Diagnosis of Fetal Abnormalities.- Complementary Role of Sonography and Arteriography in Diagnosis and Management of Uterine Choriocarcinoma.- Fetal Cephalometry Using a Multiple Head Transducer Scanning Device.- Use of Multihead Transducer Scanner in Amniocentesis.- Early Pregnancy Diagnosis with A-Mode Ultrasound.- Observations in Fetal Heart Motion by Ultrasound Real Time Imaging.- B.P.D. Growth Standards in the Rhesus Monkey.- Neurology.- The Causes of Transient Variations in the Magnitude of the Systolic Pulsations in Amplitude of Echoes Recorded from Cerebral Interfaces: The Absence of Any Relationship with Variations in Regional Blood Flow.- Ultrasound Visualization of Intracranial Hemorrhage.- Ultrasound Potentiation of Chemotherapy for Brain Malignancy.- Standstill or Progress in Echoencephalography?.- Absorption of Ultrasonic Energy by the Skull.- Midli…