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Stransky's sign is a clinical sign in which there is a unilateral absence of the nasolabial fold, often due to facial palsy. It is named after the Czech neurologist, Karel Stransky.

Overview

The nasolabial fold is the deep crease running from either side of the nose down towards the corners of the mouth. This fold becomes more prominent with smiling or laughing. It can be absent on one side of the face when the facial nerve, which controls the muscles of facial expression, is damaged. This is known as facial palsy.

Causes

The most common cause of unilateral facial palsy is Bell's palsy, but it can also be caused by a stroke, Lyme disease, or a brain tumor. Other causes can include Ramsay Hunt syndrome, sarcoidosis, and HIV infection.

Diagnosis

The diagnosis of Stransky's sign is clinical, based on the patient's history and physical examination. The doctor will look for an absence of the nasolabial fold on one side of the face, along with other signs of facial palsy such as drooping of the mouth or eye on the same side.

Treatment

Treatment of Stransky's sign involves treating the underlying cause of the facial palsy. This may involve medications such as corticosteroids for Bell's palsy, antibiotics for Lyme disease, or surgery for a brain tumor.

See also

• Bell's palsy
• Facial palsy
• Stroke
• Lyme disease
• Brain tumor

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