“…In decreasing order, the sacrococcygeal regium (40%) ovaries (25%), testicles (12%), brain (5%), neck and mediastinum (18%) may be involved [4,7]. The mediastinum is the second most common site for teratomas in the paediatric population, after thymomas, accounting for 8% of all mediastinal tumours [6][7][8]. More than 80% of them are located in the anterior mediastinum [4,8,9], space located between retrosternum and the anterior face of heart and great vessels that includes thymus, lymph nodes as well as fat and connective tissue [9].…”