A 58 year old woman presents with retrosternal chest pain for 6 hours. The pain was gradual in onset, is sharp in nature, radiates to her neck, worsens with coughing and lying down and is relieved upon learning forward. There is no associated nausea, diaphoresis or dyspnea.

She was diagnosed with diabetes and hypertension 7 years ago, which are well controlled. No other co-morbidities are present.

Her full blood count, ESR and renal functions are found to be normal.