Fetus-in-Fetu and the Surgeon’s Mandate: Defining a Threshold for Intervention Beyond Diagnostic Fascination

The captivating condition of fetus-in-fetu (FIF) has long held a singular position in surgical literature, often presented as a diagnostic curiosity culminating in a technical triumph of excision. While case reports and series meticulously detail embryological theories, imaging hallmarks, and operative techniques, a critical, unresolved question persists: What is the precise ethical and clinical threshold that mandates surgical intervention? The surgical community must now move beyond diagnostic fascination to establish a clear, principled mandate.