<prompt> All cause brain lesions exceptGiardiasisTuberculosisCysticercosisBacteroides  <response>: A Giardiasis G. lamblia is seen typically within the crypts in duodenum It does not invade tissues, but remains tightly attached by means of the sucking disc to the epithelial surface in the duodenum and jejunum. The diarrhoea in some cases may be steatorrhoeic with excess mucus and fat, but no blood. Children may develop chronic diarrhoea, malabsorption, weight loss and a sprue-like syndrome. Occasionally giardia may colonise the gallbladder, causing biliary colic and jaundice. 