Introduction: Isolated pleural effusion in severe OHSS is a rare occurrence and is typically associated with high peak estradiol. This case highlights that pleural effusion in setting of severe OHSS can occur in the absence of most of the recognized risk factors for OHSS, including in patients with a low estradiol. It is also the first case report of isolated pleural effusion in OHSS where a Cabergoline resuce protocol was used. Case Report: A 32-year-old known to have Polycystic Ovarian Syndrome (PCOS) underwent Controlled Ovarian Stimulation with hCG trigger, followed by cryopreservation. Her Estradiol on day of hCG trigger was 1761 pg/ml. Due to her history of PCOS, she was started on Cabergoline for prevention of OHSS. On day 7 following hCG trigger, the patient noted new onset of gastroesophageal reflux which was progressive until presentation the emergency room on day 9 for chest pressure. Her abdominal exam was benign. Cardiac workup was negative. She was diagnosed with bilateral pleural effusions (R>L) by CT scan, thought to be secondary to OHSS. She underwent a right thoracentesis where a 450cc of pleural fluid was drained from the right hemithorax. Following the procedure, her symptoms resolved. Conclusion: This report suggests that low/normal E2 is not protective against development of severe