{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T21:44:00Z","timestamp":1790891040426,"version":"4.1.0"},"reference-count":41,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"2","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,2,1]]},"abstract":"<jats:sec>\n<jats:title>OBJECTIVE<\/jats:title>\n<jats:p>Biopsies of peripheral nerve tumors (PNTs) are often used to plan an efficient treatment strategy. However, performing a biopsy is controversial when the mass is likely to be a benign PNT (BPNT). The aim of this study was to evaluate the side effects of biopsies in patients with potential PNTs.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>METHODS<\/jats:title>\n<jats:p>A retrospective and cross-sectional study was conducted on 24 patients who underwent biopsy of a mass of unknown origin potentially originating from a peripheral nerve (MUOPON), performed in nonspecialty services, and who were later referred to the authors\u2019 service for resection of their lesion between January 2005 and December 2022. The patients were evaluated for pain score, presence of a motor or sensory deficit, biopsy diagnosis, and definitive histopathological postsurgical diagnosis.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>RESULTS<\/jats:title>\n<jats:p>The location of the tumor was supraclavicular in 7 (29.2%) patients, in the axillary region in 3 (12.5%), in the upper limb in 7 (29.2%), and in the lower limb in 7 (29.2%). Twenty-one (87.5%) patients were evaluated by MRI before biopsy, and 3 (12.5%) underwent ultrasound. One patient did not have an examination before the procedure. Based on the biopsy findings, 12 (50%) analyses had an inconclusive histopathological result. The preexisting pain worsened, as measured 1 week after biopsy, in all patients and had remained unchanged at the first evaluation by the authors (median 3 months, range 2\u20134 months). In 1 case, the open biopsy had to be interrupted because the patient experienced excruciating pain. Four (16.7%) patients developed motor deficits. Subsequent surgery was hampered by scar formation and intratumoral hemorrhage in 5 (20.8%) patients. The initial diagnosis obtained by biopsy differed from the final histopathological diagnosis in all patients, of whom 21 (87.5%) had BPNTs, 2 (8.3%) malignant peripheral nerve sheath tumors, and 1 (4.2%) an ancient schwannoma.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>CONCLUSIONS<\/jats:title>\n<jats:p>Biopsies of PNTs are controversial and may result in misdiagnosis, neuropathic pain, or neurological deficit due to axonal damage, and they may also hinder microsurgical resection when if performed when not indicated. Indications for biopsy of an MUOPON must be carefully considered, especially if BPNT is a possible diagnosis.<\/jats:p>\n<\/jats:sec>","DOI":"10.3171\/2023.5.jns23385","type":"journal-article","created":{"date-parts":[[2023,8,26]],"date-time":"2023-08-26T03:47:47Z","timestamp":1693021667000},"page":"480-488","source":"Crossref","is-referenced-by-count":9,"title":["When biopsy goes wrong: a case series of misdiagnoses and complications from biopsies of masses of unknown origin potentially originating from a peripheral nerve"],"prefix":"10.3171","volume":"140","author":[{"given":"Fernando","family":"Guedes","sequence":"first","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"},{"name":"Peripheral Nerves Unit, Division of Neurosurgery, Pedro Ernesto University Hospital (HUPE), University of the State of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vin\u00edcius M.","family":"Henriques","sequence":"additional","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco L.","family":"Torr\u00e3o","sequence":"additional","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Neder P.","family":"Haikal","sequence":"additional","affiliation":[{"name":"Peripheral Nerves Unit, Division of Neurosurgery, Pedro Ernesto University Hospital (HUPE), University of the State of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel E.","family":"Sanches","sequence":"additional","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel A. N.","family":"Barbosa","sequence":"additional","affiliation":[{"name":"Department of Neurosurgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Felipe G.","family":"Marsicano","sequence":"additional","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Livia A. N.","family":"Rosa","sequence":"additional","affiliation":[{"name":"Department of Surgery, Neurosurgery Division, Gaffr\u00e9e and Guinle University Hospital (HUGG), Federal University of the State of Rio de Janeiro (UNIRIO), Rio de Janeiro, Brazil;"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ana C.","family":"Siquara","sequence":"additional","affiliation":[{"name":"Pathology Division, Ant\u00f4nio Pedro University Hospital (HUAP), Federal Fluminense University (UFF), Niter\u00f3i, Rio de Janeiro, Brazil; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martijn J. 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