Apparent diffusion coefficient of intracranial germ cell tumors

Area of Science:

• Neuroradiology
• Pediatric Oncology
• Medical Imaging

Background:

• The diagnostic role of Diffusion Weighted Imaging (DWI) and apparent diffusion coefficient (ADC) in intracranial germ cell tumors (GCTs) requires further clarification.
• Histological subtyping and treatment response prediction remain key challenges in managing GCTs.

Purpose of the Study:

• To investigate the correlation between ADC values and the histological subtypes of intracranial GCTs.
• To determine if ADC values can predict treatment response in patients with GCTs.

Main Methods:

• Retrospective analysis of ADC values in the enhancing and solid regions of GCTs from ten pediatric patients.
• Comparison of absolute and normalized ADC values between germinoma and nongerminomatous GCT (NGGCT) subtypes.
• Evaluation of ADC changes before and after chemotherapy in relation to treatment outcomes.

Main Results:

• Significantly lower mean absolute and normalized ADC values were observed in germinomas compared to NGGCTs (p = 0.01).
• ADC values showed a trend towards increasing more after initial chemotherapy in patients achieving complete response versus those requiring further surgery.
• The study included four germinomas and six NGGCTs (five mixed GCTs, one immature teratoma).

Conclusions:

• ADC assessment aids in differentiating histological subtypes of intracranial GCTs.
• ADC values may serve as a valuable tool for predicting treatment response in GCT patients.