Histopathology of Hirschsprung disease, also known as aganglionosis

Histopathology of Hirschsprung disease, also known as aganglionosis. Enzyme histochemistry showing aberrant acetylcholine esterase (AChE)-positive fibres (brown) in the lamina propria mucosae. | By Marvin 101 – Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4670973