Fig. 8.

48-year-old woman with perforated mucinous carcinoma of appendix.

A. Contrast-enhanced axial CT scans show irregular, peripheral enhancing low-density lesion (arrows) connected to cecum (arrowhead). This air-containing lesion extends laterally to abdominal wall through retroperitoneum, and it mimics appearance of perforated appendicitis with periappendiceal abscess.

B. Nonenhanced axial CT image shows intratumoral calcifications (short arrows). Perforated mucinous carcinoma of appendix with direct invasion into abdominal wall was pathologically confirmed.