Commentary

The triad segmental anhidrosis/hypohidrosis, Adie's pupil, and hyporeflexia define this syndrome; however, the complete syndrome may need many years to be established. [...]incomplete forms of Ross syndrome are rather common. About anhidrosis, the intradermal injection of pilocarpine 0.1% or methacoline 0.1% is useful to determinate the location of the alteration in the neural via. [...]if the injection provokes sweating, it indicates a preganglionar lesion.