UWOMJ V 16 No 4 November 1946

Page 1

University of Western Ontario

MEDICAL Volume 16

JOURNAL

NOVEMBER, 1946

Number 4

Carcinoma of the Caecum and of the Left Colon By ROSCOE R. GRAHAM, M.B. Toronto O consider carcinoma of the caecum as a clinical entity apart from carcinoma of the left colon might, on superficial thought, be considered to be of only academic interest. This, however, is not the case. The clinical picture resulting from carcinoma of the caecum is entirely different from that which results from carcinoma of the left colon. As a result, the diagnosis and treatment of carcinoma of the caecum present difficulties which arise because of the difference in the content of the right, as opposed to the left colon, as well as from the different physiological function of these two areas.

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90 % of the fluids and 10% of the solids taken out of the gastrointestinal tract are absorbed by that section of colon which lies between the ileo-caecal valve and the splenic flexure. The content of the right colon is fluid, or semi-solid, while the content of the left colon is dehydrated, solid or semi-solid. The colon from the splenic flexure to the sigmoid is but a highway, and in normal health is empty. Likewise is the rectum empty, the sigmoid colon acting as a reservoir. In addition to this difference in t he physiological function of the right, as opposed to the left colon, there is also a definite anatomical difference. The colon from the caput coli to the mid-transverse colon has a very rich blood supply from the superior mesenteric artery, which gives three branches-the ileo-caecal, the right colic and the middle colic. These three branches have, however, free anastomosis with each other, there being as many as three arcades of anastomotic vessels between these three main sources, whereas on the left side there is a very poor anastomotic circulation between the left colic and the middle colic arteries. There are no arcades of anastomotic vessels, and the connection is solely by means of the marginal artery which parallels the colon. Furthermore, there is also a very poor anastomosis between the left colic and the first sigmoid branch. The four sigmoid arteries, however, have a very free anastomosis one with the other, but again 1~9


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