Fine needle aspiration cytology of endometriosis of left inguinal region. A case report

We experienced a case of endometriosis of the leftinguinal region in which the fine needle aspiration cytology (FNAC) was very useful in making a diagnosis. The patient was a 35 year-old woman who came to our hospital with a chief complaint of left inguinal mass. The mass was painful during menstruation and on palpation. FNAC of the mass was then performed and a Papanicolaou stain of the smear showed groups of epithelial cells with a sheet arrangement, stromal cells with an irregular arrangement and regenerative cells with a sheet arrangement without nuclear atypia. The background of the smear was fresh blood. The above findings were consistent with endometriosis and therefore, the diagnosis was easily made in this case. FNAC was thought to be an efficient tool for the identification of endometriosis.