Right Sided Sigmoid Colon and Redundant Loop of Descending Colon with Its Embryological Correlation and Clinical Significance

Anatomical variations of colon are mostly developmental and can lead to variety of acute and chronic pathological conditions. So it becomes important to recognize and understand the importance of clinical implications of such anomalies to benefit surgeons, clinical geneticists and research community. We describe two cases of right sided sigmoid colon and long descending colon which had two segments: vertical and horizontal. The mesentery of ascending and descending colon was retained. This mesentery along with the mesentery of transverse colon was continuous with the mesentery of small intestine. There were variations in blood vessels supplying these anomalous colons. The findings of this study may be helpful to make surgeons and radiologists aware about different varieties of presentations while undertaking an investigative or surgical procedure in this area like sigmoidoscopy, percutaneous cecostomy and anterior transperitoneal aproach of kidney to avoid colon puncture.