Leptomeningeal metastasis from solid tumours: EANO–ESMO Clinical Practice Guideline for diagnosis, treatment and follow-up

•This Clinical Practice Guideline provides recommendations for managing leptomeningeal metastases from solid tumours.•The guideline covers clinical, imaging and cytological diagnosis, staging and risk assessment, treatment and follow-up.•A treatment and management algorithm is provided.•The author panel encompasses a multidisciplinary group of experts from different institutions and countries in Europe.•Recommendations are based on available scientific data and the authors’ collective expert opinion.