Pulmonary Arteriovenous Malformations (AVMs) are rarely seen direct abnormal communications between pulmonary arteries and pulmonary veins. It is usually congenital. Lesions may appear as a single isolated anomaly but most AVMs occur in individuals with hereditary haemorrhagic telangiectasia. The cases may be asymptomatic. The classic radiological images on PA chest X-ray reveal round, smooth, and limited lesions. Together with the gold standard pulmonary angiography, chest X-ray, computed tomography with contrast and contrast echocardiography are another diagnostic tools used in diagnosis. We present a case of pulmonary AVM together with the literature knowledge due to its rare occurrence, which is a single isolated lesion with normal physical examination findings, admitted to our outpatient department with a complaint of upper respiratory tract infection, in a 51-year-old man.