Introduction: Spontaneous subarachnoid haemorrhage (SAH) is caused by a ruptured aneurysm in most cases. In 15% of cases, no vascular abnormality can be found. This subset is classified according to blood distribution, which can be perimesencephalic or non-perimesencephalic. Perimesencephalic subarachnoid haemorrhage (PM-SAH) is the least common phenomenon. It has a favourable prognosis with negligible long-term complications. A high index of suspicion is needed to identify this group of patients. This report highlighted the current consensus for managing these patients. It also highlighted the need for further research as no cause has been identified. Patient presentation: A 35-year-old male developed PM-SAH during physical exertion. He had no risk factors and was well below the described age of being in the 6th decade of life. Management and outcome: The patient was admitted to an intensive care unit and had digital subtraction angiography performed within the prescribed 24 h–48 h. This modality digitally s
Koller et al. (Mon,) studied this question.