This article reports a case of 3rd Kabnick class heat-induced thrombus 2.63 cm in length that developed after the endovenous laser photocoagulation of the great saphenous vein. The treatment with rivaroxaban (15 mg 2 times daily) was prescribed to the patient. The control examination was timed to the first day on which the clot became unapparent. We suggested the possibility of pulmonary embolism in our patient based on the experience of this clinic and the literature data. Despite the absence of explicit symptoms and the stable condition of the patient, the spiral computed tomography contrast angiography of the lungs was performed. It demonstrated the lumen of the pulmonary arteries fairly well preserved up to the segmental branches. In our opinion, one of the probable causes of the disappearance of the occlusive thrombus could be its fragmentation. The anticoagulation treatment was continued for a further 2 week period in order to prevent the development of extended thrombosis of unknown localization. One month later, the patient’s condition was stable, the great saphenous vein remained occluded. The article provides, in addition, an overview of the most cited articles on the problem of heat-induced thrombosis.