Spinal drop metastases of choroid plexus papilloma: a brief report and updated literature review.

Choroid plexus papillomas (CPPs) are rare central nervous system benign tumours and spinal metastases are even less frequent. Herein, we describe a case of a 51-year-old man with several episodes of loss of consciousness. Brain magnetic resonance imaging (MRI) displayed a fourth ventricle contrast-enhancing lesion that was totally resected, and histopathological findings showed a papillary neoplasm derived from choroid plexus epithelium, with mild pleomorphism and absence of mitotic activity, consistent with CPP. Two months after the first operation, multiple spinal drop metastases at L4, L5 and S1-S2 were revealed through spine MRI. Histological examination of the spinal lesions fulfilled as well the diagnostic criteria for CPP. Radiological and histological findings are presented, and the relevant literature of spinal spreading of CPPs is discussed. This special case, together with the literature review, helps expanding the spectrum of knowledge on benign CPPs, their potential for disease spread and progression and highlights the need to identify biomarkers that correlate with clinical behaviour.