Apparent diffusion coefficient in malignant lymphoma and carcinoma involving cavernous sinus evaluated by line scan...

Area of Science:

• Radiology
• Oncology
• Medical Imaging

Background:

• Cavernous sinus tumors present diagnostic challenges.
• Differentiating between malignant lymphomas and carcinomas is crucial for treatment planning.

Purpose of the Study:

• To evaluate the apparent diffusion coefficient (ADC) of malignant lymphomas and carcinomas in the cavernous sinus using line scan diffusion-weighted imaging (LSDWI).
• To assess the utility of LSDWI-derived ADC values in distinguishing between these two tumor types.

Main Methods:

• Prospective study of 10 patients (4 malignant lymphomas, 6 carcinomas).
• Acquisition of LSDWI images at b values of 5 and 1000 s/mm² in the coronal plane.
• Calculation and comparison of ADC values between lymphomas and carcinomas.

Main Results:

• LSDWI yielded diagnostic images with minimal artifacts, enabling ADC measurement.
• Malignant lymphomas exhibited a mean ADC of 0.51 ± 0.06 x 10⁻³ mm²/s.
• Carcinomas showed a significantly higher mean ADC of 0.99 ± 0.08 x 10⁻³ mm²/s (P < 0.01).

Conclusions:

• Malignant lymphomas have significantly lower ADC values compared to carcinomas.
• ADC measurements using LSDWI provide valuable information for differentiating cavernous sinus lymphomas from carcinomas.