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. This case highlights the use of cross sectional imaging in cases of diagnostic uncertainty in the situation of antenatally diagnosed left upper quadrant mass. The findings were unusual and present an interesting example of how the multi disciplinary team is essential in the approach and management of complex presentations.