Carotid body tumour: a rare case of isolated unilateral Horner’s syndrome

Horner’s syndrome is characterised by ptosis, miosis, anhidrosis, and enophthalmos. It results from disruption of the sympathetic pathway from the hypothalamus to the eye. The aetiology in adults is dependent on the location of the lesion, which is divided into preganglionic (first- order neuron or second-order neuron lesion) and postganglionic (third-order neuron lesion).1 We present a rare case of a 60-year-old woman who presented with isolated unilateral left-sided Horner’s syndrome. Magnetic Resonance Imaging (MRI) scan of her head and neck showed a left-sided carotid body tumor. This case emphasises the need to consider carotid body tumor in patients presenting with