Introduction:
Lymphatic cysts are congenital malformations that predominantly occur in the head and neck region. Intra-abdominal lesions are rare and may be present in the mesentery, retroperitoneal space, and greater omentum. When a cyst in the abdominal cavity is suspected, ultrasonography is the diagnostic procedure of choice. Radical resection, if feasible, is the preferred treatment, as incomplete excision can lead to recurrence. However, for lesions located in the mesentery and retroperitoneal space, aspiration with the administration of obliterating agents may be a better approach than surgical treatment. In recent years, laparoscopy has become a favorable alternative to laparotomy.

Case report:
A 2-year-old girl was referred for surgery due to the presence of fluid in the abdominal cavity along with a coexisting right-sided hydrocele of the canal of Nuck. During the surgical procedure, a large multilocular lesion originating from the greater omentum and extending into the hernia sac of a right inguinal hernia was identified. The cyst was resected laparoscopically, and the inguinal hernia was repaired. Histopathological examination confirmed a lymphatic cyst.

Conclusions:
Laparoscopic resection is a safe method for treating a large lymphatic cyst of the greater omentum.