Mucous Filaments

Mucous filaments appear as thin threadlike structures crossing the colonic lumen or lying upon one or more semicircular folds. They can occur after a preparation without or with faecal tagging. In the latter case these filaments can be tagged or non-tagged. They can changed in shape with dual positioning. However they may simulate the stalk of a polyp. It is important not to misinterpret it as a polyp and vice versa. In the latter case they are not connected to the head of a polyp. However sometimes the mucous filament is attached to a semicircular fold simulating the head of a polyp on 2D images (Fig. 4.17). Care has to be taken not to misinterpret a polyp with a thin stalk as a mucous filament (Fig 4.18).

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