Figure 4From: Internal gallbladder drainage prevents development of acute cholecystitis in a pig model: a randomized studyGallbladder from drained pig. The mucosa is intact with a normal number of mononuclear cells (mostly lymphocytes). The muscle and subserosal layers are unremarkable without significant edema, lymphatic dilatation or inflammation. Hematoxylin & eosin.Back to article page