Abstract Body (Do not enter title and authors here): Introduction
Cardio-cerebral infarction, a rare clinical presentation involving simultaneous acute ischemic stroke and acute myocardial infarction, poses significant therapeutic challenges. The incidence of this dual infarction is currently unknown due to its rarity. Delaying intervention for one condition to address the other can lead to permanent morbidity, disability, or even death. Coronary artery fistulas are uncommon with estimated incidence of 0.3%. Among these, a fistula between the left anterior descending artery and the pulmonary artery is the rarest variant, comprising about 17% of all coronary artery fistula cases.

Case
A 54-year-old male, with a known history of atrial fibrillation and hypertension, presented to our emergency department with non-rotatory dizziness. Physical examination was unremarkable, but neurological examination revealed medial rectus palsy and left facial asymmetry. A cranial MRI indicated a hyperacute infarction in the left cerebellum. Laboratory tests showed markedly elevated troponin I levels (>50 ng/ml) and atrial fibrillation, along with inferior wall ST elevation on the electrocardiogram. Due to the high risk of hemorrhagic conversion, the loading of antiplatelets was deferred. Instead, the patient was treated with Aspirin 80 mg once daily, Clopidogrel 75 mg once daily, and Enoxaparin 0.4 ml subcutaneously once daily. A 2D echocardiogram revealed an ejection fraction of 43%, hypokinesia of the anterior and intraventricular septum from base to apex, and severe mitral stenosis. Cardiac catheterization identified a coronary artery fistula from the left anterior descending coronary artery to the main pulmonary artery. Treatment for acute coronary syndrome and acute cerebellar infarct continued. An open-heart surgery was considered. However, during his hospital stay, the patient experienced hemorrhagic conversion and altered sensorium. His condition further deteriorated, necessitating a tracheostomy and long-term care.

Conclusion
Cardio-cerebral infarction is an extremely rare and poorly studied syndrome that presents significant treatment challenges and carries a grave prognosis if not addressed immediately. The medical conundrum of deciding which condition to treat first underscores the need for further research. Both interventional cardiologists and interventional neuroradiologists play crucial roles in the effective management of this emergency condition.