Primary peritoneal low-grade serous carcinoma detected in cervical smear: Pitfalls mitigated by clinicocytopathologic clues and cellblock immunocytochemistry.

Pap smears play a role in detecting extrauterine serous tumours in asymptomatic women. Certain cytopathologic and histopathologic findings combined with relevant clinical and radiologic findings indicate the possibility of primary peritoneal serous tumours. Cellblock immunohistochemistry is a valuable confirmatory diagnostic tool.