Klippel-Feil syndrome (KFS) is a rare condition characterized by the congenital fusion of any two of the seventh cervical vertebrae. ¹ Sprengel′s deformity (SD) is a congenital structural abnormality of the shoulder girdle; receive surgical treatment as a child or adolescence. Therefore, it is rare to identify an adult with untreated SD. ² Neurological complications are various such as spastic paraplegia, mental weakness, and syringomyelia. ³

The omovertebral bone is characterized as an abnormality in the musculoskeletal system. In this anomaly, scapula, and the cervical spine are connected to each other. ⁴ However, some studies reported association between SD and omovertebral bone and introduced it as KFS. ² Shoulder girdle anomaly concomitant with muscle disorder such as hypoplasia or atrophy are called SD. ¹ , ⁵ Vertebral fusion of cervical spines is rare, but it is possible to occur in that spines. This rare situation is seen in the KFS. ² Maurice Klippel and Andre Feil separately described this syndrome for first time in 1912. First symptoms that they explained were including short neck, restricted motion of the neck, and low hairline. After that time, some patients with same features are reported. ⁶ The prevalence of this syndrome is unclear, but some studies believe that its prevalence is about 1 in 40,000 of alive newborns. ⁷ Furthermore, this syndrome affect female more than male. ⁷

It should be considered in the setting of neurological symptoms characteristic of cervical myelopathy in patients with obvious skeletal dysmorphias of unknown etiology. ⁸ Short neck, low hairline, and restricted neck motion are diagnostic triad is present in less than half of the patients. ⁹ We report a 50-year-old woman who suffered from neck pain and ataxia for a long time. To the best of our knowledge, there is one study that presented a patient with this topic. ⁸

A 50-year-old woman admitted to the Alzahra Hospital, Isfahan, Iran. She presented with a 2 years history of neck pain and ataxia for 1 year. She hadn′t urinary incontinence and she was referred to a neurosurgeon by a Neurologist because of her progressive gait ataxia.

Neurological examination showed intact cranial nerves and no motor deficit, but we found impairment in pain sensory and light touch in both legs that was prominent on the right side of the body, hyperreflexia in the left knee, ankle jerk, and mild gait ataxia based on tandem and blind walking. Blood tests and urinalysis were normal. Physical examination revealed a short neck, a low occipital hairline and diminished cervical range of motion. The patient also had an elevated left scapula and a bony prominence extending from the shoulder to the neck. The range of motion of the neck and left shoulder was restricted. Anteroposterior and lateral radiographs revealed fused vertebral body of C5-C6 without spina bifida Figure 1, Figure 2a and b]. Figure 1

Multislice computed tomography, three dimensional

Maurice Klippel and Andre Feil explained a syndrome separately that is defined by a clinical triad include short neck, restricted range of motion in the neck and low posterior hairline. This syndrome is known as KFS. After that time, some patients with this syndrome found extra anomalies that can be accompanying to KFS. About 50% of patients who are suffered from it have that triad. Causes of KFS return to embryonic period when cervical vertebra is forming. Some authors introduced error in segmentation as a reason for KFS. The prevalence of KFS has been reported about 1 of 40,000 or 1 of 42,000 persons and most of them are female. ¹⁰ Present case was a woman who had mentioned triad.

According to the level of vertebral fusion, some studies classified it into three groups: (1) Many vertebras in cervical and thoracic zone are fused to each other, (2) Fusion is seen in one or two vertebra like a fusion between C2-C3 or C5-C6, and (3) vertebras are associated with each other in cervical and thoracic or lumbar zone accompany with other anomalies. ¹¹ Our patient had fusion between C5-C6 with an elevated left scapula and a bony prominence extending from the shoulder to the neck.

Torticollis and loss of symmetrical expression of the face has been reported in 10% and 11.5% of cases with KFS respectively. ¹² However in about our case, there is no torticollis.

Our patient that was a rare presentation in that age had multiple anomalies including SD, omovertebral bone, and scoliosis.

As it is mentioned, symptoms and signs that point to KFS are various and it can present as cosmetic problems or severe problem such as predisposing to severe neurologic damage. Thus, sometimes it is introduced as an emergent situation and if you misdiagnose it, it will remain serious neurologic sequel. ¹³

SD is another anomaly that is seen in 7-42% of cases with KFS. Elevation of scapula is the most prominent feature of it. This anomaly results in cosmetic deformity and muscular dysfunction of upper limb. Muscular dysfunction resulted from some common defects in the trapezius, rhomboids and levator scapulae and some uncommon defects in muscles such as the pectoralis major/minor, latissimus dorsi, sternocleidomastoid, and serratus anterior. Differentiation of scapula occurs in 5 ^thweek of gestation. ¹⁴ This process is started at levels of 4-6 cervical spines and then it descends to normal location opposite to second to seventh vertebra of thoracic. Events that happen in that time can cause SD omovertebral bone is seen in 25-35% (even 50% in some studies) of patients who are suffered from SD. ¹⁵ In fact, it is a cartilaginous or bony and or fibrous tissue with a firm covers that fuse the scapula and processes of cervical spines. ¹⁶ Conservative treatment is not acceptable in SD and surgery usually is useful for removing deformity. ² However, when physicians make a diagnosis and plan treatment, they should search the features of KFS and SD.

The case of a unilateral SD and KFS as an etiology for cervical myelopathy is unique in the adults. Risk for brachial plexus injury because of compression or stretching by the clavicle accelerate with age. Therefore, the surgical approach of adults′ patients with SD can intend suitable surgical conclusions.