Anatomical variations of inferior vena cava and its tributaries are not uncommon during abdominal and pelvic surgeries. Among the variations of inferior ven a cava the in frarenal type is rare. During the routine dissection of a male cadaver, such rare variation in formation of i nferior vena cava was found associated with agenesis of common iliac vei n. Although they may not be of functional importance but knowled ge of such vari ation s is essenti al for surgical point of view. Some variations are common and some are rare. It becomes essential to find out their structu ral and function al importance in the body. Unfortunately, they are missed during preoperative assessment of patients even in the era of advanced radiological interventions unless they are hazardous or altered any function. Therefore, developmental origin of these variants gets equal attention
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