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Fig. 7C —10-year-old boy with malignant peritoneal mesothelioma who
presented with abdominal distention. Photomicrograph shows variably thickened
fibrous cystic walls with lining mesothelial cells (H and E, x40). On
electron microscopy (not shown), there were glandular arrangements of plump
epithelial cells with large irregular nuclei and prominent nucleoli. Luminal
surfaces of epithelial cells showed well-developed, long, and slender
microvilli. Based on histopathologic and electron microscopic findings,
diagnosis of malignant peritoneal mesothelioma with cystic change was
made.