Doctors had to perform some reconstructive procedures on the man's anus and intestines, but as the rectum was not perforated, the man is expected to make a full recovery.
Staff at the San Juan de Dios Hospital said the man is currently in stable condition.
Cassava root, also known as yuca, is a starchy root which is common in South America, where is is used as a stable carb.
The starch derived from the cassava is also known as tapioca, used all over the world as a thickening agent, in desserts such as tapioca pudding, and in the popular Asian 'bubble tea' drink.
Coincidentally, the American Cancer Society warns that those with a latex rubber allergy may suffer a reaction to the plant and should avoid eating cassava or tapioca.