[Sonographic representation of the normal and acute inflamed appendix--in patients wi right-sided abdominal pain].

The detectability, vascularization and size of the normal and inflamed appendix were investigated in the study. 148 patients under suspicion of appendicitis or with lower right abdominal pain were studied over a period of five months beginning in January 1998. An ultrasound-transducer was employed at a wave length of 3.5 MHz to 10 MHz. Vascularization was measured using 'Duplex' and 'Color Angio'. The results were compared with operative evidence, histology and patient history. The appendix was detected in about 30% of the cases (47/148). But of the presumably normal appendices only 12% (13/109) were detected. 27 appendices sonographically diagnosed as acutely inflamed were confirmed by operation and phlegmonic. The acute appendicitis was sonographically diagnosed with a sensitivity of 82% and a specificity of 95%. The diameter of the normal appendices was an average of 5.5 mm, that of the acute was 12.2 mm whereby 21 of 25 organs were at least 9 mm. The measurement of the organ size seems to be more helpful than the detection of vascularization. Both methods alone cannot detect the acute phlegmonic appendicitis. The normal appendix was less frequently detected than described in current literature. Patients with pain present difficulties in ultra-sound examination because both the cooperation and the time for the correct diagnosis are limited.