Periclavicular multifocal, infiltrative extraneural soft tissue perineuriomas: illustrative case

This case highlights the importance of a thorough workup of soft tissue and peripheral nerve sheath masses. There is extraordinary difficulty in diagnosing and treating extraneural perineuriomas, given their wide array of clinicopathological presentations, and it is crucial that these tumors are accurately identified to avoid overtreatment. https://thejns.org/doi/10.3171/CASE24388.