Abdomen Radiology

Anterior to liver: Anterior-Superior bubble, Ill defined periduodenal lucency, Right upper quadrant slit, Lucent liver, Falciform ligament sign, Ligamentum teres sign, diaphragm Muscle slip sign (leaping dolphin sign); Within the liver: Ligamentum teres fissure sign; Posterior to liver: Morison's pouch- Doge's cap sign; Inferior to the liver: hepatic edge sign, ligamentum teres notch sign, visible gallbladder

Lesser sac gas, cupola sign, visible lower cardiac border

left sided pneumoperitoneum

Rigler's sign, triangle sign, football sign, visible transverse mesocolon, visible small bowel mesentery, pneumoomentum, pneumomesocolon

urachus, medial umbilical folds, lateral umbilical folds, visible bladder roof, pneumoscrotum, isolated lower abdominal free air

free air in hiatal hernia sac, free air in ventral hernia sac

midrectus sign, pararectus sign

basal plate like atelectasis, irregular diaphragmatic contour, Chilaiditi's syndrome (colonic interposition), decresaed liver size (small liver or partial hepatectomy), subphrenic fat, pneumomediastinum, pneumopericardium, pneumothorax, upper abdominal abscess, extraperitoneal air- anterior, pneumoretroperitoneum

Liver and adjacent abscesses, skin folds, abdominal wall defects, fat in the fissure for the ligamentum teres, air in the biliary tree, portal venous gas, periduodenal retroperitoneal air

excessive fat in the properitoneal space, abundant appendices epiploicae, two adjacent gas filled bowel loops, retained intraluminal contrast material, air in the bowel wall, retroperitoneal air

postoperative, post diagnostic procedure, penetrating trauma, blunt traumatic rupture of the duodenum, pelvic trauma with perforation of the rectum, spontaneous colon perforation (volvulus, diverticulosis, carcinoma), extension from pneumomediastinum, gas containing retroperitoneal abscess

Pneumoperitoneum, abscesses within the liver or spleen, subphrenic abscess, fat in the renal sinuses, excessive retroperitoneal fat, retroperitoneal hemorrhage, fat in the psoas muscles, spontaneous subcutaneous emphysema, Iatrogenic subcutaneous emphysema

1/250th of a cc.