AFP and Langerhans cell histiocytosis: In the LCH group, the mean values (range) of CSF and serum β-hCG were 4.3 IU/L (2–6) and 0, respectively, while CSF and serum αFP were 0.55 ng/mL (0.2–0.7) and 2.5 ng/mL (1.0–5.4), respectively.