{Reference Type}: Case Reports {Title}: Ruptured Lung Hydatid Cyst Masquerading as a Transudative Parapneumonic Effusion: A Case Report. {Author}: Singh B;Mehta KN; {Journal}: Iran J Parasitol {Volume}: 19 {Issue}: 2 {Year}: 2024 Apr-Jun {Factor}: 1.217 {DOI}: 10.18502/ijpa.v19i2.15864 {Abstract}: Hydatid disease can virtually involve any organs, liver being the most common followed by lungs. Pleural effusion as a complication of pulmonary hydatid cyst is exceptionally rare and its diagnosis and treatment pose significant challenges. We present an intriguing case managed in Dr D Y Patil medical college and Hospital in west India in June 2023 involving a 70-year-old female who presented with symptoms of right-sided chest pain and acute-onset dyspnoea. Referred from a local hospital, a chest radiograph revealed the presence of right pleural effusion. Subsequent radiological investigations including a contrast enhanced CT at our centre exposed two large, well-defined hypodense lesions with fluid density, encased by thick enhancing walls, along with right-sided pleural effusion and hence a diagnosis of lung abscess with right pleural effusion (right parapneumonic effusion) was established. Despite ongoing care, clinical improvement eluded us. Thoracocentesis yielded a surprising revelation - the pleural fluid was transudative with visible hooklets and protoscolices, indicating a ruptured pulmonary hydatid cyst. The patient began albendazole treatment and received a CVTS consultation. They recommended a right lower lobe lobectomy, now scheduled for the near future.