Neuroradiology Case of the Day
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1 Neuroradiology Case of the Day 76 th CAR Annual Meeting, Montreal, Quebec April 27, 2013 Eugene Yu, MD Assistant Professor of Radiology and Otolaryngology-Head and Neck Surgery Head and Neck Imaging Princess Margaret Hospital University of Toronto
2 Disclosure of Commercial Interests Neither I nor my immediate family members have a financial relationship with a commercial organization that may have a direct or indirect interest in the content.
3 The Case History: 62 year old female presents with 6 month history of left facial fullness, trismus and left V3 distribution numbness
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5 Left parotid mass
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10 T2WI
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15 Enhanced T1WI
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27 Foramen ovale
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33 Case of the Day Considerations: Parotid mass - nonspecific Curvilinear structure - to cavernous sinus Clinical features are concerning Trismus, numbness Dealing with a neoplasm - malignant
34 Parotid Malignancy
35 Parotid Malignancy Perineural disease Facial nerve
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37 Pierces parotid fascia Into the gland Communicates with CN 7 via two rami
38 Perineural Tumor Spread Adenoid cystic carcinoma parotid mass Perineural tumor spread Auriculotemporal nerve Cavernous sinus
39 Highlight Perineural Disease
40 Perineural Disease Spread of tumor along nerves Neurotropic carcinomatous spread First described in mid-1800 s
41 Nerve Sheath Anatomy
42 Perineural Invasion Liebig et al, 2009 Cancer Tumor cells within any of the three layers of the nerve sheath Tumor foci outside of the nerve with involvement > 33% of the nerve s circumference
43 Perineural Invasion Physiological basis Due to reciprocal nerve signaling interactions between tumor and nerves
44 Perineural Invasion Tumor cells express proteinases Help migrate through extracellular matrix and nerve sheath
45 Perineural Invasion What it does not involve Not tracking along lymphatics Lymphatics do not penetrate into the nerve sheath Not due to spread along path of least resistance Collagen, basement membrane
46 Perineural Invasion Pathologist: Perineural invasion is a contiguous process
47 Perineural Invasion Significance of PNI 3x increased rate of local recurrence Decreased survival 30% 5yr Increased LN recurrence Influence therapy Can make disease unresectable Influence surgical approach XRT, chemotherapy
48 Perineural Tumor Spread Perineural tumor spread: PTS Different from perineural invasion Macroscopic tracking of tumor along nerves Tumor uses nerve as a scaffold Visible on imaging
49 Clinical Symptoms Clinical features: 40% asymptomatic - imaging may be the first to pick it up Pain Paresthesia Muscle weakness Diplopia
50 Disease Entities Squamous cell carcinoma Melanoma Adenoid cystic carcinoma Lymphoma
51 Imaging Features Computed Tomography and MRI: Increased size of nerve, enhancement Widened neuroforamen Erosion of adjacent bony margins Loss of normal fat planes Muscle atrophy
52 How to Image MRI scan > CT scan Contrast enhanced scanning Narrow FOV 16-18cm High resolution matrix Slice thickness 3mm
53 Imaging Features Magnetic resonance imaging: T1 pre gadolinium scan T1 post gad ± fat saturation
54 Imaging Features Image all the way back along the course of the nerve Antegrade as well as retrograde spread
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57 Nerve enlargement
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65 Denervation atrophy
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72 Loss of fluid signal in Meckel s cave
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84 Conclusion ATN Perineural tumor spread Significance of PNTS Anatomy - knowing what to look for Clinical history
85 Pterygopalatine Fossa Pterygopalatine Fossa Space between posterior margin of maxillary sinus and the pterygoid process V2 as it exits foramen rotundum travels through here - predominantly fat density
86 Pterygopalatine Fossa The relay station : Nasal cavity - sphenopalatine foramen Masticator space - pterygomaxillary fissure Orbit - Superior/inferior orbital fissure Intracranial - Foramen Rotundum, Vidian canal
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90 ACC
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92 Enhancement and widening Greater palatine foramen
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96 Pterygopalatine foramen
97 V2 along foramen rotundum
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103 Greater palatine foramen
104 Pterygopalatine fossa
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110 Right sided ACC palate
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127 Any palate tumor Check the palatine foramen and PPF
128 Conclusion ATN Perineural tumor spread Significance of PNTS Imaging technique Knowing what to look for Clinical history
129 Perineural Tumor Spread Adenoid cystic carcinoma Can we diagnose its full extent?
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131 Perineural Tumor Spread Retrospective studies Various histology of HN cancer Except Hanna, et al - ACC Gandhi, et al - cutaneous HN cancer Pre-operative MRI ± CT Surgical resection and pathology evaluation
132 Perineural Tumor Spread Nemzek et al, pts 19 patients - picked only those with (+) histo PNS and deemed resectable MRI sensitivity for detection 95% Sensitivity to map full extent 63% Hanna et al, consecutive patients - all ACC underwent resection CT sens 88% spec 89% MRI sens 100% spec 85% Gandhi et al, patients - cutaneous malignancy, clinically suspected PND (+) MRI MRI sens 100% Sensitivity to map full extent 83.3%
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