Surgical Pathology of the Head and Neck [Vol 2] - download pdf or read online

By L. Barnes

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Figure 8 Coronal MRI demonstrates the herniation of the encephalocele through the frontal cribriform plate into the right nasal cavity (arrow). Imaging Imaging studies must be performed for any congenital frontonasal mass to exclude a skull defect with intracranial extension before surgery, which is important to help guide the appropriate surgical approach. CT and MRI together allow better visualization of a smoothly marginated soft tissue mass through a bony defect in the skull. MRI is superior for imaging brain tissue preferentially (Figs.

Somatic Genetics Figure 14 Localized ovoid intraneural neurofibroma with attached segment of nerve. Chromosome studies of neurofibromas are scarce, with only a few reports of clonally abnormal karyotypes (35). Among the abnormal karyotypes, the only Chapter 12: Tumors of the Nervous System C. 683 Plexiform Neurofibroma Introduction Plexiform neurofibromatosis (PNF) is a grossly and microscopically highly characteristic variant of neurofibroma, and it is generally regarded as pathognomic of NF1, although a small group of patients with a solitary PNF may lack the association (1–4).

Introduction Although discussed with neurogenic tumors, the traumatic neuroma, also known as amputation neuroma, is a reactive nonneoplastic process, rather than a true neoplasm (1–5). It represents a pseudotumorous condition characterized by disorganized proliferation of axons, Schwann cells, and perineurial cells in a fibrocollagenous stroma. Following a nerve injury, either transection or crush, the proximal segment of a disrupted peripheral nerve undergoes a reparative response, while the distal segment undergoes complete degeneration of residual axons and myelin sheaths (Wallerian degeneration) (1–3,6).

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Surgical Pathology of the Head and Neck [Vol 2] by L. Barnes


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