RT Journal Article SR Electronic T1 Muco-epidermoid tumours of the anal canal JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 200 OP 205 DO 10.1136/jcp.16.3.200 VO 16 IS 3 A1 Morson, B. C. A1 Volkstädt, H. YR 1963 UL http://jcp.bmj.com/content/16/3/200.abstract AB The pathology of 21 cases of muco-epidermoid carcinoma of the anal canal is described. These tumours are defined as squamous or transitional cell carcinomas containing areas which secrete mucin of undoubted epithelial origin within the clumps of tumour cells. They are found in that part of the anal canal just above the dentate line where the epithelium is variable in type and represents an embryological transition between rectal and squamous mucous membrane. The histogenesis of these tumours is discussed and the opinion given that they arise from the surface epithelium of the upper anal canal rather than from the anal glands.