MUC5AC and neoplasm: The findings on the final pathological report were as follows: multifocal and multinodular tumor with numerous psammomatous calcifications, tumor made with polygonal cells showing a tubulopapillary proliferation pattern, cells present on the peritoneal surface and invading the underlying tissue inducing desmoplasia, tumor cells of intermediate size with a moderately abundant eosinophilic cytoplasm, round and slightly irregular nuclei with prominent nucleoli, weak mitotic activity, no intracytoplasmic mucin on periodic acid-Schiff diastase (PAS-D) staining.