Feasibility, Sensitivity, and Specificity of Postprocedure Peritoneal Cytology

Area of Science:

• Gynecologic Oncology
• Cytopathology
• Surgical Pathology

Background:

• Hysterectomy is a common procedure for gynecologic cancers.
• Accurate staging and detection of metastasis are crucial for patient outcomes.
• Cytopathologic evaluation of surgical specimens aids in diagnosis and staging.

Purpose of the Study:

• To assess the feasibility of cytopathologic evaluation of postprocedure washings after hysterectomy for gynecologic cancer.
• To determine the diagnostic performance of postprocedure washings compared to preprocedure washings.
• To evaluate the potential benefit of postprocedure cytology in detecting microscopic peritoneal metastasis.

Main Methods:

• Retrospective review of 92 cases of hysterectomy for malignancy.
• Analysis of cytology reports for both preprocedure and postprocedure washings.
• Comparison of cytopathologic findings between preprocedure and postprocedure samples.

Main Results:

• High satisfaction rates for both preprocedure (98.7%) and postprocedure (99.3%) washings.
• Insignificant discordance in malignant cell detection between pre- and postprocedure washings (P = .267).
• Lower sensitivity of postprocedure cytology for detecting malignant cells compared to preprocedure cytology (28.6% vs 57.1%, P = .041), with similar specificities (94%).
• Four cases of endometrial cancer showed positive postprocedure cytology despite negative preprocedure cytology.

Conclusions:

• Postprocedure peritoneal cytology is feasible following hysterectomy for gynecologic cancer.
• This technique may enhance the detection of microscopic peritoneal metastasis or surgical cancer cell seeding.
• Postprocedure cytology could offer additional diagnostic value, particularly in early-stage disease.