Radiological characteristics of perforated pulmonary hydatid cysts

Perforation of pulmonary hydatid cysts into the bronchial tree was seen in 56 of 239 cases. The resulting radiological signs are much more specific than those seen prior to perforation. These signs are described and correlated with the cystic structures that give rise to them. Perforation into the pleural cavity, seen in 5 cases, may result in secondary hydatidosis, as happened in one case.