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Pathology Quiz Case 1: Diagnosis
Arch Otolaryngol Head Neck Surg. 2009;135(10):1058-1059.
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Diagnosis: Sino-orbital cystic echinococcosis (CE)
Cystic echinococcosis, or hydatid cyst disease, is a globally distributed zoonotic infection caused by the cestode species Echinococcus granulosus.1 The adult parasite is a small tapeworm that infects the small intestine of carnivores, usually canids. Their eggs are shed in the feces of these definitive hosts and are inadvertently ingested by intermediate hosts such as sheep. In endemic areas, such as the Turkana district of Kenya, where people live in close proximity to their dogs and livestock, humans may accidentally ingest the eggs and also become infected. After ingestion, worm embryos, called oncospheres, are released from the eggs, migrate through the intestinal wall, and spread hematogenously. Once lodged in a capillary bed, the oncospheres develop into metacestodes, which are slow-growing, unilocular larval cysts also known as hydatid cysts. They have an outer acellular, laminated layer exclusive to the genus Echinococcus and an inner living, germinal layer from . . . [Full Text of this Article]
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Pathology Quiz Case 1
Michael W. Groves, Susan Müller, Samuel Gathere, Andrew Gachii, and Michael M. Johns, III
Arch Otolaryngol Head Neck Surg. 2009;135(10):1056.
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