• Michael A Bohl, Jean-Christophe Leveque, Stephen Bayles, and Rajiv Sethi.
• Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA; Neuroscience Institute, Virginia Mason Medical Center, Seattle, Washington, USA. Electronic address: Michael.Bohl@bnaneuro.net.
• World Neurosurg. 2019 Aug 1; 128: 4104-10.

BackgroundDesmoid tumors are known to be rare and relatively slow growing with locally invasive histology and high recurrence rates. A rare subset of these tumors occurs adjacent to the spinal column after surgery. Since 1961, only 6 cases of postoperative paraspinal desmoid tumor have been reported. This report is the first to describe the occurrence of a paraspinal desmoid tumor after surgical correction of a spinal deformity.Case DescriptionA 56-year-old woman with multiple sclerosis reported 2-3 years of progressively worsening mid and low back pain that was worse with standing and ambulation and almost completely relieved with lying flat. Standing anteroposterior scoliosis radiographs revealed a thoracolumbar spinal deformity, which was surgically corrected with a T4 pelvis spinal fixation and fusion. At her 2-year postoperative clinic visit the patient reported good improvement in her preoperative symptoms but felt a fullness in her right upper back and neck that was nontender. Magnetic resonance imaging revealed a large tumor in this region. The tumor was resected en bloc, and pathology noted a 14.5 cm × 8.7 cm × 4.2 cm mass with spindle cell proliferation and positive staining for β-catenin (mutated gene found in 85% of desmoid tumors).ConclusionsThis is the first report of a postoperative desmoid tumor after spinal deformity correction and the seventh reported case in the spine literature. All reported cases have been women aged 39-57 years. The patient will be followed closely with magnetic resonance imaging given the known high local recurrence rate of this tumor.Copyright © 2019 Elsevier Inc. All rights reserved.

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