Figure 1.

Liquid biopsy and CSF cytology results from surgery until three weeks post-operatively. Tumor location in relation to CSF reservoir as denoted on diagnostic MRI (contact with CSF; yes/no). Residual tumor tissue as denoted on post-operative MRI (post-op res; yes/no). Follow-up time based on the date of last MRI (y, year; m, month; d, day, asterisk denotes diseased). CSF, cerebrospinal fluid; P, plasma. CSF cytology (triangles) and ctDNA results (circles). ctDNA positive samples in red, trace positive samples in orange, and negative samples in grey.