Unusual Position and Size of the Appendix and the Sigma Colon

The topography of the large intestine and the additional elements, like the appendix, are well known, but their variants deserve further attention. During our academic dissection of the cadaver, completed with medical students, we encountered unusual length of the Vermiform Appendix (VA), as well as abnormal size, position and curves of the descending and Sigmoid Colon. The position of the VA was retroperitoneal and retrocaecal. The size was 16.3 cm. The topography of colon parts also showed peculiarities, which differed from the norm. After the left colic flexure, the descendent colon was directed down and close to the left portions of the small intestine. Instead of moving curve less to the lower left abdomen, the colon was directed obliquely and to the right, and passed to the caecum. The observed position of the large intestine led us to the description of its topographic classification, embryonic origin and attaching apparatus. This unusual move of the descendent colon and the subsequent sigma makes the case interesting for the abdominal surgical practice.