We encountered a rare case of the sigmoid colon in a 39-year-old Turkish female cadaver during routine dissection practice for medical students. The sigmoid colon was excessively long and formed a wide loop which was in direct contact with the gall-bladder. It consisted of four parts. The first part began in the left iliac fossa, turned the right and passed across left psoas and then reached in front of the promontory of the sacrum; the second turned upward and ascended along anterior surface of the ascending colon to inferior surface of the liver. It then curved on itself and turned forward. The third part descended along the anterior surface of the second part to the promontory; the fourth curved left and downward and ended in the rectum. Colon was normal at other positions. The sigmoid colon was completely surrounded by peritoneum, which forms the sigmoid mesocolon. The inferior mesenteric artery divided into four branches, the left colic, two sigmoid, and the superior rectal arteries. First part of the sigmoid colon was supplied by the left colic artery. The Sigmoid Arteries, two in number, supplied the other parts. This anomalous colon was measured morphometrically and its clinical importance was also assessed.