The purpose of this study is to determine the benefit of stereotaxic aspiration for patients with primary brainstem hemorrhage with the guidance of 'Zhe-er Classification'

This is a retrospective study aiming to analyze the clinical record of patients from March 2014 to October 2020. This study is indicated for primary brainstem hemorrhage.

no new patients will be enrolled within this project

Inclusion Criteria:

• Patients undergoing a stereotaxic aspiration or conservative therapy from 3/2014 to 10/2020 in 2nd Affiliated Hospital, School of Medicine, Zhejiang University, China

Exclusion Criteria:

• patients with secondary brainstem hemorrhage due to blood vessel malformation, trauma, or malignancies

All patients with primary brainstem hemorrhage who receive stereotaxic aspiration or conservative therapy from 3/2014 to 10/2020 in 2nd Affiliated Hospital, School of Medicine, Zhejiang University, China