Heart failure (HF) caused by constrictive pericarditis (CP) is very rare, but has a significant healing potential. In order to diagnose it, an initial high level of suspicion is imperative, given that HF presents in a setting lacking clinical signs capable of pinpointing a specific aetiology. However, current modern imaging techniques permit the accurate construction of a diagnosis for CP, clearing the way for surgical treatment. We are describing the case of a 60-year-old male who was hospitalised to our Cardiology Department due to a history of HF that gradually progressed to the congestion stage over the past six months. The diagnosis of CP was established after the examination of echocardiography and cardiac magnetic resonance imaging results. The patient underwent subtotal pericardectomy, and to this date, he has made a full recovery. The purpose of this case report is to highlight the importance of considering less common causes of HF, in addition to the common ones, in order to devise the most appropriate investigations and expedite surgical correction of this condition.