Selected topics in peritoneal pathology.

Area of Science:

• Pathology
• Gynecologic Pathology
• Surgical Pathology

Background:

• Selected peritoneal lesions, including multilocular peritoneal inclusion cysts, are often misdiagnosed.
• Reactive mesothelial proliferations can mimic mesothelioma.
• Peritoneal lesions require careful distinction from neoplasms and reactive processes.

Purpose of the Study:

• To review selected peritoneal lesions, emphasizing diagnostic criteria and potential pitfalls.
• To differentiate reactive mesothelial proliferations from mesothelioma.
• To discuss various peritoneal pathologies, including peritonitis, mesotheliomas, and müllerian lesions.

Main Methods:

• Review of literature and case studies, particularly those involving Dr. Robert E. Scully.
• Analysis of gross and microscopic features of peritoneal lesions.
• Consideration of clinical findings and immunohistochemical markers for diagnosis.

Main Results:

• Multilocular peritoneal inclusion cysts are generally non-neoplastic.
• Florid mesothelial hyperplasia can be mistaken for mesothelioma.
• Nodular aggregates of histiocytes may mimic metastasis.
• Well-differentiated papillary mesothelioma requires careful evaluation due to potential overlap with malignant mesothelioma.
• Benign müllerian lesions like endometriosis can present diagnostic challenges.

Conclusions:

• Accurate diagnosis of peritoneal lesions relies on careful assessment of morphological features and clinical context.
• Distinguishing reactive mesothelial proliferations from mesothelioma is crucial.
• Awareness of the spectrum of peritoneal pathologies, including benign and neoplastic entities, aids in correct diagnosis.