Omental Involvement

Omental involvement means that the omentum (a fatty, apron-like sheet of tissue that hangs from the stomach and drapes over the abdominal organs) has been infiltrated by tumor. In peritoneal mesothelioma and other abdominal cancers, this often appears on imaging as thickening, nodules, or a thick mat of disease called an "omental cake."

Origin

The word "omentum" comes from the Latin term for a fold of membrane covering the bowels, used in anatomical writing since antiquity. "Omental cake" entered radiology literature in the mid-20th century to describe the dense, plaque-like tumor infiltration seen on imaging.

Significance in Asbestos Context

For patients with peritoneal mesothelioma, omental involvement is one of the most common and important findings. It influences staging, surgical planning, and prognosis. Surgeons performing cytoreductive surgery (CRS) with HIPEC routinely remove the omentum (omentectomy) because it is a frequent site of tumor seeding. The extent of omental disease contributes to the Peritoneal Cancer Index (PCI) score, which helps determine whether aggressive surgery is feasible. Documentation of omental involvement in CT reports, operative notes, and pathology is also important medical evidence linking the abdominal disease to asbestos exposure when peritoneal mesothelioma is diagnosed.

Example Sentence

The CT scan showed omental caking and ascites, which prompted a biopsy that ultimately confirmed peritoneal mesothelioma.

Related Terms

Peritoneal Mesothelioma, Omental Cake, Peritoneal Cancer Index (PCI), Cytoreductive Surgery, HIPEC, Ascites

Notes

• Ask your oncologist or surgeon how extensive the omental disease is and whether it affects your eligibility for cytoreductive surgery with HIPEC.
• Request copies of CT, MRI, and PET reports that describe the omentum. Phrases like "omental thickening," "nodularity," or "omental cake" should be preserved for both medical and legal records.
• If you undergo surgery, obtain the operative report and the pathology report on the resected omentum; these documents are key evidence of the disease's location and extent.
• Omental involvement is far more common in peritoneal than pleural mesothelioma. Make sure your care team includes a surgeon experienced in peritoneal surface malignancies.