You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Protozoa associated with megaesophagus and explain in detail?
Megaesophagus and megacolon occur as complications of chronic Chagas disease.
T. cruzi causes Chagas' disease 
Chaga's disease

1.  Acute form

Occurs in infants and children.
Presents with fever, unilateral face swelling, lymphadenopathy, splenomegaly and chagoma (Localized swelling of the skin).

2.  Chronic form

Occurs in adolescent and adults
Presents with cardiac arrhythmias and neurological manifestations.
Complications → megacolon, megaesophagus, cardiomyopathy.

Romana's sign
When entry of the parasite is through the conjunctiva, an edematous swelling of eyelids of one eye develops.