The acute abdomen represents an emergency condition
which requires urgent diagnosis and therapy. Sonography
plays an important role as a fast, effective and efficient imaging
modality. Most causes of the acute abdomen can be diagnosed
with ultrasound, however, ultrasound has its domain
in the diagnosis of biliary tract disorders and in evaluating abdominal
tumors. Beside B-mode sonography, contrast-enhanced
ultrasound is increasingly used to diagnose organ infarction.
Sensitivity as well as specificity in the diagnosis of
acute appendicitis are high, and sonography may play an important
role in describing sigma diverticulitis. Although the
pancreas is often invisible due to gas, newer studies describe
the use of contrast-enhanced sonography in this context. Intraabdominal
fluid can be punctured sonographically, and
cysts, abscesses and exsudates may be cured with drainages.
Sonographically guided biopsy helps in the diagnosis of suspect
solid lesion in the abdomen. Sonography may diagnose
the most common causes of acute abdomen. However, the
multifactorial etiology of this condition represents a challenge,
and interdisciplinary cooperation is essential.