Fetus-in-fetu found at excision of antenatally diagnosed abdominal mass: Multi-disciplinary approach

Abstract We present a case of antenatally detected abdominal mass and an alternative diagnostic course for suspected neonatal neuroblastoma as a result of investigative findings. A female infant presented antenatally with a left upper quadrant mass initially managed as a suspected neonatal neuroblastoma; further cross sectional imaging suggested a wider differential including teratoma and aided surgical planning. The multi disciplinary team (MDT) decision was for an early excision at 31 days and post operative histology identified a diagnosis of fetus-in-fetu (FIF). We describe this case as a compliment to the current literature and an example of a necessary variation to recognised diagnostic and treatment pathways as a result of investigative findings.