The purpose of the present study is to compare the characteristics, i.e. efficacy, duration, safety and hospital stay, of a frameless fiducial-less brain biopsy method with those of the standard frame-based stereotactic technique. Inclusion criteria: adult patients with cerebral lesions: 1) for whom no conclusive diagnosis could be settled in a noninvasive manner; and 2a) who also had surgically inaccessible lesions (or involving eloquent areas), or multifocal lesions, or lesions for which the probable diagnosis is a contraindication for craniotomy, or 2b) were too ill or too old for open craniotomy. Type of Intervention: standard frame-based stereotactic brain biopsy technique or frameless fiducial-less method using an optical based navigation system and a mini frame apparatus - trajectory guide.
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Diagnostic result
Timeframe: One month postoperatively
Complications
Timeframe: One month postoperatively