Infected pulmonary hydatid cyst: A challenging diagnosis.

Echinococcosis is a parasitic infection that is distributed worldwide. Its clinical presentation depends on the size and location of the cyst. A 7-year-old was found with a superimposed infected pulmonary hydatid cyst that was initially misdiagnosed as complicated pneumonia. Our case underscores the challenges of diagnosing and managing echinococcosis, emphasizes the need for a high index of suspicion, and describes the disease's ability to mimic other clinical entities.