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J Neurol Surg B Skull Base 2012; 73 - A110
DOI: 10.1055/s-0032-1312158

Patterns of Dural Involvement in Anterior Skull Base Tumors: Prospective Correlation of MRI and Histopathologic Findings

Pete S. Batra 1(presenter), John B. McIntyre 1, Carlos L. Perez 1, Mrudula Penta 1, Liyue Tong 1, John Truelson 1
  • 1Dallas, USA

Introduction: The presence of dural invasion serves as an important negative predictive factor for survival in sinonasal and skull base neoplasms. The objective of this study was to prospectively correlate preoperative MRI findings with intraoperative surgical findings and histopathology to establish key correlates for dural involvement in sinonasal tumors.

Methods: Prospective blinded MRI review of 50 sinonasal and anterior skull base neoplasms was performed by a staff neuroradiologist. Retrospective chart review was performed to accrue salient patient and tumor data.

Results: The mean patient age was 54.6 years with male:female ratio of 1.8:1. The most common tumor histology included adenocarcinoma (18%), squamous cell carcinoma (18%), mucosal melanoma (8%), and olfactory neuroblastoma (8%). MR imaging demonstrated dural enhancement in 20 patients (40%), with 1 mm and ≥2 mm thickening being noted in 14 (70%) and 6 (30%) cases, respectively. Spectrum of MR findings in these 20 patients included linear enhancement in 15 (75%), nodular thickening in 5 (25%), and loss of hypointense zone in 13 (65%) cases. Intraoperative findings and histology confirmed dural invasion in 12 of 20 cases (60%). Positive predictive value (PPV) of linear and nodular dural enhancement for dural invasion was 46.7% and 100%, respectively. One mm and ≥2 mm of dural thickening demonstrated PPV of 42.9% and 100%, respectively. Loss of the hypointense zone had PPV of 92.3% for dural invasion. Fisher's exact test demonstrated that loss of hypointense zone and dural thickening ≥2 mm statistically associated with dural involvement (P-value < 0.05).

Conclusion: The presence of ≥2 mm of dural thickening, loss of hypointense zone, and nodular dural enhancement were highly predictive for presence of dural invasion by sinonasal malignant tumors. Preoperative knowledge of these MRI patterns may better guide surgical planning and patient counseling.