Drop metastases are metastases that spread caudally due to gravity. They are intradural extramedullary space-occupying lesions originating from intracranial space-occupying lesions[^1].
Epidemiology
Drop metastases occur in 5-30% of all children with a brain tumor, with medulloblastoma being the most common cause and accounting for approximately half of all drop metastases in children[^3]. Drop metastases occur in approximately 1% of all patients with glioblastoma[^1].
Tumor entities
Drop metastases can be caused by various intracranial tumors[^2]:
PNET
Localization
Drop metastases occur most frequently in the lower thoracic Spine and lumbar spine[^1].
Symptoms
Drop metastases typically cause back pain and may be accompanied by corresponding neurological deficits.