| hydatid d. |
an infection, usually of the liver or lungs, caused by larval forms (hydatid cysts) of tapeworms of the genus Echinococcus, and characterized by the development of expanding cysts; it occurs in humans, cattle, sheep, pigs, horses, and occasionally other mammals. The two types are alveolar and unilocular. Called also hydatidosis, echinococcus d., and echinococcosis.
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| hydatid d., alveolar |
infection with larval forms (hydatid cysts) of Echinococcus multilocularis, characterized by invasion and destruction of tissues as the cysts undergo endogenous budding to form an aggregate of small cysts that honeycomb the affected organ (usually the liver); they may metastasize later. Click here to view image■Alveolar hydatid disease, in a cross-section of a human liver.
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| hydatid d., unilocular |
infection with the larval forms (hydatid cysts) of Echinococcus granulosus, characterized by the formation of unilocular single or multiple expanding cysts; as the cysts expand they may give rise to symptoms of space-occupying lesions in the tissues or organs affected.
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