A 9-month-old girl presented with progressive abdominal distension. Imaging revealed a huge cystic mass in the left retroperitoneum with solid components. The right kidney was absent and hydrometrocolpos was found. Tumour drainage and complete surgical excision were performed. A bulge in the right side of the uterus, suggestive of a uterine anomaly, was seen on laparoscopic observation. Pathology was consistent with teratoma with a small portion of immature neural tissue. The patient was discharged in good condition and was advised regular follow-up.
Keywords: congenital disorders; paediatric oncology.
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