Malignant mesothelioma of the greater omentum mimicking omental infarction: A case report

Figure 1 Abdominal computed tomography (CT) and ultrasonography (US). A: Initial abdominal CT revealed a mass-like lesion of about 7 cm × 3 cm at the greater omentum; B: Abdominal CT follow-up after 1 wk antibiotic therapy showed an increased omental mass lesion, with a shift to the right lower abdomen, and ascites; C: Abdominal US showed a heterogeneous echoic mass at the greater omentum, and ascites; D: Multiple round nodules at the peritoneum and ascites.

Figure 2 Laparoscopic findings. A: Greater omental mass of 8 cm × 3.3 cm with coarsely nodular surface; B: Variable-sized metastatic nodules adhered to the parietal peritoneum.

Figure 3 Photomicrographs of laparoscopically resected omental mass. A: Proliferating epithelioid tumor cells formed tubular, cystic or papillary structures (HE, × 100, bar 100 μm); B: Tumor cells were strongly positive for calretinin upon immunohistochemical staining (× 100, bar 100 μm).