It may occur secondary to mechanical (intramural/extramural masses, foreign bodies) or functional (hypokalaemia or hypothyroidism) obstructions which prevent defecation for prolonged periods. In this case no underlying disorder was found. | It may occur secondary to mechanical (intramural/extramural masses, foreign bodies) or functional (hypokalaemia or hypothyroidism) obstructions which prevent defecation for prolonged periods. In this case no underlying disorder was found. |