RT Journal Article SR Electronic T1 Infected pulmonary hydatid cyst JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 433 OP 436 DO 10.15537/smj.2024.45.4.20230078 VO 45 IS 4 A1 AlRashed, Fahad M. A1 AlShahrani, Dayel A. YR 2024 UL http://smj.org.sa/content/45/4/433.abstract AB 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.