Which symptom is associated with Klumpke's palsy?

Klumpke's palsy is a form of brachial plexus injury that specifically affects the lower roots of the plexus, typically C8 and T1. One characteristic symptom associated with this condition is Horner's syndrome, which results from disruption of sympathetic nerve pathways. The clinical features of Horner's syndrome include ptosis (drooping of the eyelid), miosis (constricted pupil), and anhidrosis (lack of sweating) on the affected side of the face. This occurs due to the involvement of the sympathetic nerves that travel alongside the brachial plexus.

In the context of Klumpke's palsy, the injury can lead to the interruption of these sympathetic fibers, thus manifesting Horner's syndrome as a notable symptom. The presence of this syndrome helps in understanding the specific pathways affected by the injury, making it a significant finding in cases of Klumpke's palsy.

The other symptoms listed, such as loss of sensation over the lateral forearm, loss of finger abduction, and weakness of wrist flexion, would typically be more associated with injuries involving different parts of the brachial plexus or other conditions altogether, and does not reflect the typical presentation seen with Klumpke's