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Arch Otolaryngol Head Neck Surg. 2005;131:1029.

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Diagnosis: Hydatid cyst of the neck

Echinococcosis is a parasitic disease that is caused by the cestodes of the genus Echinococcus. Infections due to Echinococcus granulosus, which is the most common species, are still relatively widespread in the Mediterranean countries.¹ The infestation occurs either by direct ingestion or indirectly from contaminated water or food. The primary hosts in echinococcal infestations are dogs; the intermediate hosts include sheep, cattle, horses, and, occasionally, humans.¹ In man, E granulosus larvae form a primary cyst, which can continue to increase in size to 20 cm in diameter.² Typically, echinococcosis consists of a single, unilocular cyst; however, 20% to 30% of cases may have several cysts in 1 organ or 1 cyst in multiple organs.³ A hydatid cyst has a trilaminar wall. The outermost layer, which is called an ectocyst, is composed of compressed host tissue. The 2 inner layers are formed by the parasitic origin. The intermediate layer, . . . [Full Text of this Article]

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Arch Otolaryngol Head Neck Surg. 2005;131(11):1025.
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