The curious case of free-floating pelvic cysts

Area of Science:

• Gynecologic pathology
• Surgical pathology
• Reproductive medicine

Background:

• Mesothelial cysts are rare, typically benign fluid-filled sacs originating from the peritoneum.
• Their incidental discovery during pregnancy is uncommon, especially when free-floating and unattached to organs.

Observation:

• A healthy 33-year-old woman undergoing elective caesarean section presented with small, free-floating cysts in the pelvic peritoneum.
• Initial gross examination was inconclusive, necessitating detailed histopathological analysis.

Findings:

• Histopathology definitively classified the cysts as benign mesothelial cysts.
• The cysts were notably non-adherent to any pelvic or abdominal structures, deviating from typical descriptions.

Implications:

• This case highlights the importance of histopathology for diagnosing unusual peritoneal findings during pregnancy.
• It expands the differential diagnosis for free-floating pelvic masses discovered incidentally in obstetric patients.