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It is concluded that specific reference ranges for duodenal mucosal disaccharidase activity are required as this is less than that of jejunum. Reduced duodenal disaccharidase activity is usually but not invariably associated with morphological abnormality.

The clinical and pathological features of 6 cases of appendiceal endometriosis are reported. The appendix alone was involved in 3. Thefindings have been compared with previously reported cases. One of the largest deposits caused intussusception but otherwise the microscopic size of deposits did not correlate with symptomatology. The diagnosis may be suspected when the abdominalpain does not shvt from theperi-umbilical region to the right iliac fossa in the manner of classic appendicitis and when the symptoms begin during or are exacerbated by menstruation.

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