Therapeutic actions in a 2-month-old child with teratoma and duodenal malrotation accompaniment

•A mature mediastinal teratoma is a rare type of tumor that can contain fully developed tissues.•Benign, more common in female and may require surgical removal.•Evaluation for malrotation should be part of every upper GI tract examination in pediatric patients.•In this case, surgical intervention could enhance both malrotation and mediastinal teratoma.•Finally, in this case, surgical intervention could enhance both malrotation and mediastinal teratoma.