title: Fetus in fetu.
abstract: A 2-month-old boy was found to have an abdominal mass in the left upper quadrant. Surgical removal revealed the mass to be a fetus in fetu. Dissection and roentgenologic examination unequivocally demonstrated the presence of vertebral column and organs arranged appropriately to the vertebral axis.
mesh_terms: D000008:Abdominal Neoplasms / Q000175:diagnosis / Q000473:pathology; D003937:Diagnosis, Differential; D005333:Fetus / Q000473:pathology*; D006801:Humans; D007223:Infant; D008297:Male; D013724:Teratoma / Q000175:diagnosis / Q000473:pathology