Clinical Notes
January 4, 1964

Calcified Echinococcus (Hydatid) Cyst of the Spleen

JAMA. 1964;187(1):62-63. doi:10.1001/jama.1964.03060140068025

OF THE PARASITES which infest man, Echinococcus granulosus has been rightfully called the most dramatic actor.1 The adult worm is one of the smallest, measuring 2.5 mm to 9 mm in length, and its cysts are the largest, reaching up to 20 cm in diameter.2 Almost any organ in the body may be involved by the cystic form, the liver and lungs being invaded in 85% of the cases.2,4 Hydatid cysts of the spleen, however, are comparatively rare, and account for 0.8% to 3.7% of all cases of hydatid disease.1,3

A comprehensive review of the literature by Katz and Pan in 19583 disclosed that from 1822 to 1956 only 17 cases of hydatid cysts of the spleen had been reported in the US. Since then, one additional case has been described.5 Mills and Fowler1 collected 47 cases from the world's literature between 1900

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