Fetus-in-fetu: A Rare Congenital Anomaly

Abstract

Two cases of fetus-in-fetu, on which we performed surgery in 2003 and 2006, are being reported. Both the cases presented with a lump in the abdomen. Radiology confirmed the diagnosis. The lumps were found in the retroperitoneum and successfully excised. Because of the rarity of the condition, these two cases are being reported with relevant salient features and are discussed in the light of available literature.

Keywords: Abdominal lump; axial skeleton; fetus-in-fetu; retroperitoneal; teratoma.

Figure 1

Gross specimen of both fetuses after excision of sac

Figure 2

USG showing bony structures with distal acoustic shadows

Figure 3

Fetus with well-developed upper and lower limbs with external genitalia

Figure 4

Dorsal dissection showing spine, rib cage, and skull

Figure 5

Barium radiology showing displacement of bowel loops and long bones

Figure 6

CT scan showing large retroperitoneal mass with a variable consistency

Figure 7

Plain skiagram of specimen showing well-formed bony structures

Figure 8

Gross specimen of fetus showing well-differentiated external genitalia