Antenatal Diagnosis of Retroperitoneal Cystic Mass: Fetiform Teratoma or Fetus in Fetu? A Case Report

BACKGROUND:Teratoma, a tumor containing variety of tissues, is broad diagnosis mature teratoma, immature and teratomas with malignant transformation. The forms during embryological development secondary to unsuccessful migration primordial germ cells. A specific type human-like features, called fetiform teratoma. teratoma often compared confused fetus in fetu, reabsorbed twin. While these tumors have commonly been described the gonads, retroperitoneal location finding on antenatal imaging rare. distinction between aforementioned subtypes not well established, proving challenging prior resection. CASE REPORT:We present case newborn male prenatal cystic mass. Although was obtained, remained unclear. After birth, planned surgical excision day life 7 showed suprarenal mass contained contiguous intestinal elements. Histopathology examination revealed multiple tissue types, including colonic, brain, respiratory, lymphatics, nerves, reminiscent This report presents an interesting example differentiating elements straddling diagnoses mentioned above. CONCLUSIONS:This first reported diagnosed especially unique for having element duplication within features fetu depend subjective distinctions. provides opportunity discuss differentials management strategies.