[Well-differentiated papillary mesothelioma--a rare neoplasm of the peritoneum]

Area of Science:

• Oncology
• Pathology
• Surgical Oncology

Background:

• Well differentiated papillary mesothelioma (WDPM) is an exceptionally rare neoplasm affecting the peritoneum.
• It typically presents as multiple small nodules on peritoneal surfaces, omentum, or mesentery.
• WDPM often exhibits an indolent clinical course, frequently discovered incidentally during surgery.

Observation:

• A case involving a 22-year-old female with cystic peritoneal lesions initially diagnosed as WDPM, later reclassified as cystic mesotheliosis upon verification.
• A second case detailing a 24-year-old male where WDPM led to omental torsion.

Findings:

• Diagnostic differentiation between WDPM and other mesothelial lesions can be challenging.
• WDPM can lead to complications such as adhesions, torsion, and strangulation.
• The patient with WDPM-induced omental torsion remained symptom-free 12 months post-operation.

Implications:

• Accurate histological differentiation is crucial for appropriate patient management.
• Understanding potential complications like torsion is important for surgical planning.
• WDPM, despite its rarity, requires careful consideration due to its potential for complications.