Although pleural involvement is relatively common in cystic hydatid di
sease, one of the rarest and least known complications is secondary pl
eural hydatidosis. We report the case of a patient who presented with
polycystic secondary pleural hydatidosis 4 yrs after treatment for a p
yopneumothorax caused by rupture of a pulmonary cyst near the pleural
space. Due to the coexistence of severe chronic obstructive pulmonary
disease, surgery was ruled out. The patient was treated with albendazo
le, with a favourable outcome.