A 28-year-old woman presented with a swelling in her right groin. She was suspected of having an inguinal hernia and was referred to surgery. There was no obvious enlargement of the mass when the abdomen was compressed in the standing position. Ultrasonography revealed a hypoechoic fluid region in the right inguinal region, with no blood flow. Computed tomography (CT) examination revealed cystic edema in the right groin and no incarceration of the intestinal canal. The patient was diagnosed as having HCN. Considering that some patients may have a HCN combined with a hernia, we explored the abdominal cavity with a laparoscope. There was a 1-cm fluid area in the inner ring area of the right groin, which oppresses the front of the groin and swells the peritoneum. Although the inner ring is slightly weak, because there was no obvious hernia, we chose the anterior approach for tumor resection. We opened the external oblique muscle fascia to confirm that the HCN was free to the preperitoneal fat, ligated the root of the canal of Nuck at a high position, and performed a complete excision of the HCN. Finally, using laparoscopy, we reconfirmed there was no defect in the peritoneum. The operative time was 56 min. The patient recovered well and was discharged the next day. Postoperative pathology showed that the size of the cyst was 4 × 4 cm. When the specimen was cut open, the capsule was filled with clear liquid and the wall was relatively smooth and flat. Hematoxylin and eosin-stained section showed HCN accompanied by obvious congestion and mild inflammatory tissue. There was no specific glandular tissue or endometrial tissue in the specimen, and no malignant cells were found.