Lumbar Calcifying Pseudoneoplasm as a Rare Cause of Cauda Equina Syndrome: A Case Report

Abstract

A calcifying pseudo-tumor of the spine, also called calcifying pseudoneoplasm of the neuraxis (CAPNON), is a rare non-neoplastic lesion that can occur anywhere in the central nervous system. Although CAPNON shows tumor-like behavior, it is believed to be benign and of inflammatory-reactive origin. It may cause many neurologic symptoms by compressing adjacent structures. We report the case of a 45-year-old man who presented with cauda equina syndrome. Magnetic resonance imaging revealed a partially calcified mass compressing the spinal cord. Gross total resection was carried out and the patient’s symptoms improved. Histopathology proved that the mass was CAPNON. Although spinal localization of CAPNON is rare, we should know and recognize this entity based on appropriate imaging findings because radical excision has an excellent prognosis.