Abstract
Summary: A 14-month-old child presented with complete duodenal obstruction due to pressure from a fetus-in-fetu. This was relieved by a subtotal excision of the tumour. The features support the diagnosis of FIF rather than abdominal teratoma. On this premise, future development of malignancy in the remnant is not anticipated. The follow-up period at the time of writing is 12 years.

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