2.2 Data extraction
Data extraction and quality assessment of all included studies were
independently performed by 2 authors (MF and BE). Controversies were
solved by discussion or consultation with another author (RS). Basic
information such as patient demographics, histopathology, presenting
complaints, surgical approaches and post-operative complications were
recorded. All included papers were clinical studies focusing on surgical
management of PPS tumors using different approaches and the
post-operative complication or sequelae.