Table 1.
Definitions of Variables
| Variable | Definition |
|---|---|
| Age | Years at time of diagnosis |
| Sex | Male or female |
| Symptoms at Diagnosis | • Asymptomatic (yes/no) • Focal deficit (yes/no) • Seizure (yes/no) • ICP related (yes/no; exemplified with H/A and cognitive deficit) |
| Performance Statusa | 0-4 |
| Date of Imaging Diagnosis | dd.mm.yyyy |
| Main Location According to ICD | C71.1 (frontal), C71.2 (temporal), C71.3 (parietal), C71.4 (occipital), C71.8 (corpus callosum or overlapping sites), C71.9 (not specified) |
| Laterality | Left/right/bilateral |
| Multifocal | Yes/no |
| Largest Diameter of Tumor | < 4 cm |
| 4–6 cm | |
| > 6 cm | |
| MRI Preop | Yes/No |
| Type of Surgery | Biopsy or resection |
| Date of Surgery | dd.mm.yyyy |
| Type of Resection (Surgeon Impression or Image Based) | Partial or radical resection |
| Complication Within 30 Days | Yes/No |
| New Focal Deficit Within 30 Days | Yes/No |
| New Seizure Within 30 Days | Yes/No |
| Any Infection Within 30 Days | Yes/No |
| Any VTE Within 30 Days | Yes/No |
| Any Hematoma Within 30 Days | Yes/No |
| Complication Leading to Reoperation Within 30 Days | Yes/No |
| Date of Discharge from Neurosurgical Department | dd.mm.yyyy |
| Histopathology | SNOMED codes Astrocytoma: 94003, 94203, 94113, 94103 Oligoastrocytoma: 93823b Oligodendroglioma: 94503 |
| Planned oncological treatment | Yes/No |
Abbreviations: H/A, headache; ICD, International Classification of Diseases; ICP, intracranial pressure; MRI, magnetic resonance imaging; preop, preoperatively; SNOMED, Systemized Nomenclature of Medicine-Clinical Terms; VTE, venous thromboembolism; WHO, World Health Organization.
aPerformance status according to WHO.
bFor oligoastrocytoma WHO grade II and oligoastrocytoma grade III, the SNOMED code is similar (92823).