Assessing the Histological Malignancy Grade of Olfactory Neuroblastoma Using the Apparent Diffusion Coefficient...

Area of Science:

• Oncology
• Radiology
• Medical Imaging

Background:

• Olfactory neuroblastoma (ONB) is a rare upper nasal cavity malignancy.
• The Hyams classification is crucial for ONB recurrence diagnosis and survival prediction.
• Histological grading is essential for determining ONB prognosis and treatment strategies.

Purpose of the Study:

• To assess the effectiveness of apparent diffusion coefficient (ADC) histogram analysis in differentiating high-grade (Hyams III-IV) from low-grade (Hyams I-II) olfactory neuroblastoma.
• To evaluate the utility of quantitative MRI parameters in non-invasively grading ONB malignancy.

Main Methods:

• Retrospective analysis of 17 ONB patients who underwent pretreatment MRI with diffusion-weighted imaging.
• Region of interest delineation on ADC maps by two radiologists.
• Calculation of ADC histogram parameters (mean, min, max, SD, skewness, kurtosis, entropy).
• Comparison of ADC parameters between low-grade and high-grade ONB groups using Mann-Whitney U tests.

Main Results:

• No statistically significant differences were observed in any ADC histogram parameters between low-grade and high-grade ONB groups.
• Mean ADC (p=0.591), minimum ADC (p=0.494), maximum ADC (p=0.625), standard deviation (p=0.433), skewness (p=0.133), kurtosis (p=0.161), and entropy (p=0.315) showed no significant variations.
• The study included 10 low-grade and 7 high-grade ONB cases.

Conclusions:

• Apparent diffusion coefficient (ADC) histogram analysis is not effective in distinguishing between high-grade and low-grade olfactory neuroblastoma based on the Hyams classification.
• Preoperative grading of ONB malignancy using ADC histogram parameters presents significant challenges.
• Further research may be needed to identify reliable imaging biomarkers for ONB grading.