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A four month old female infant† presented to the Paediatric Emergency of St. John's Medical College Hospital, Bengaluru, India, in September 2018, with excessive crying for the past four days. The child had tachycardia (110/min), tachypnoea (61/min) and reduced left-sided air entry. Chest X-ray (Fig. 1A) showed atypical left effusion. The child rapidly deteriorated over the next 12 h, requiring mechanical ventilation. Contrast-enhanced computed tomography of the chest (Fig. 1B) showed fat stranding within the fluid collection (Fig. 1C). An emergency left thoracotomy was done (Fig. 2A) which revealed a Morgagni hernia, sequestered omental cyst (Fig. 2B) and herniated transverse colon. The cyst was decompressed (Fig. 2C), omentum excised and hernia repaired. The child recovered and is well on one year follow up. The sequestration cyst was probably formed due to partial strangulation of the omentum. The increasing size led to infarction and sudden deterioration.