Pathology



Adenocarcinomas of the colon vary consider­ably in histological appearance (scirrhous, pap­illary, medullary, or colloid), but the prognosis relates to the degree of invasion of the wall or spiead at the time of discovery rather than the pathological description. The distribution of tu­mors in the colon (Fig. 41-2) is predominantly left-sided, with fully 50 per cent being within reach of a sigmoidoscope, although there seems to be an increasing tendency for tumors to be found more proximally in the colon.







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