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Questions and Answers
What is the pericyst?
What is the pericyst?
- A fluid-filled bladder inside the hydatid cyst
- The adult worm that develops in the intestine of definitive hosts
- A layer of fibrous tissue laid by fibroblasts around the hydatid cyst (correct)
- Brood capsules with scolices on the outer side of the cyst
Which hosts are involved in the life cycle of hydatid cysts?
Which hosts are involved in the life cycle of hydatid cysts?
- Only definitive hosts
- Both definitive and intermediate hosts (correct)
- Only intermediate hosts
- None of the above
What happens to old hydatid cysts?
What happens to old hydatid cysts?
- They become fluid-filled bladders
- They provide nutrition to the parasite
- They develop brood capsules with scolices
- They become sclerosed or calcified (correct)
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Study Notes
- Some embryos develop into hydatid cysts
- Fibroblasts lay fibrous tissue around the cysts
- This is known as pericyst and provides nutrition to the parasite
- The embryo develops into a fluid-filled bladder inside the pericyst
- Brood capsules with scolices develop on the inner side of the cyst
- Improper disposal of viscera from intermediate hosts can lead to infection in definitive hosts
- Adult worms develop in the intestine of definitive hosts
- Eggs are passed in the feces of infected animals
- The life cycle comes to a dead end in dogs, as they cannot access hydatid cysts in humans
- Old cysts may become sclerosed or calcified, causing the parasite within to die.
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