Double-level cervical total disc replacement for adjacent segment disease: is it a useful treatment? Description of late onset heterotopic ossification and review of the literature

We report a rare case of double-level adjacent segment disease (ASD), occurring ten years later an anterior cervical discectomy (ACD) without fusion, treated by cervical arthroplasty, highlighting the outcome at long-term follow-up and focusing on heterotopic ossification. In 1995 a 25-year-old man satisfactorily underwent ACD at C4/C5. At that time MRI also showed signs of degenerative disc disease (DDD) at C3/C4 and C5/C6. Ten years later, a new MRI scan showed a large C3/C4 and a smaller C5/C6 soft disc hernia together with spondylotic changes at the level above and below the site of the first surgery. At C4/C5 imaging revealed a kyphotic stable "pseudoarthrosis" with anterior bridging osteophyte. The patient underwent double-level arthroplasty with ProDisc-C. Clinical and radiological outcome was satisfactory. 3 and 5 years after surgery, X-rays and CT scan documented the progressive development of heterotopic ossification, with gradual reduction of range of motion. A late onset heterotopic ossification can neutralize the theoretical advantages of cervical arthroplasty, which should be considered an effective surgical option only in selected cases. ACDF and restoration of normal lordosis can be a viable alternative in cervical revision surgery, as motion preservation can not be always mantained for a long time.

Anterior, extracanalar, cervical spine osteochondroma associated with DISH: description of a very rare tumor causing bilateral vocal cord paralysis, laryngeal compression and dysphagia. Case report and review of the literature

INTRODUCTION

Osteochondromas are common benign bone tumors, rarely involving the spine.

BACKGROUND

Osteochondroma account for about 35% of bone benign tumors and 9% of all bone tumors. Spinal involvement is described in 1%-4% of cases and their origin from the anterior surface of cervical vertebral bodies is exceedingly rare.

AIM

We describe the rare case of an osteochondroma arising from the anterior surface of the C4 and C5 vertebral bodies, and not involving the spinal canal, in a 68-year-old male patient suffering from Diffuse Idiopathic Skeletal Hyperostosis (DISH).

MATERIALS AND METHODS

The patient presented with acute onset of respiratory distress due to laryngeal compression exerted by the lesion, dysphagia and paralysis of left vocal cord. Imaging revealed the unusual lesion compressing and dislocating the air ways. An anterior approach to cervical spine was performed to remove the tumor.

RESULTS

Postoperatively, the patient sustained a progressive improvement of respiratory function and recovery of the vocal cord paralysis.

DISCUSSION

We believe that this case holds some interesting peculiarities: firstly, the anterior location of a cervical osteochondroma could be considered exceptional; yet, the resulting clinical picture should be remembered for differential diagnosis. Secondly, we hypothesized a possible correlation between the tumorigenesis of osteochondroma and the co-existence of DISH. Indeed, the abnormal bone turnover in cervical segments due to DISH could explain the unusual occurrence of osteochondromas in adult age.

CONCLUSIONS

The occurrence of an osteochondroma should be considered in patients suffering from DISH and harbouring large osteophytes.

Prognostic value of EGFR expression in de novo and progressed atypical and anaplastic meningiomas: an immunohistochemical and fluorescence in situ hybridization pilot study

AIM

The aim of this study was to assess both the epidermal growth factor receptor (EGFR) protein expression by immunohistochemistry and the EGFR gene amplification by fluorescence in situ hybridization in meningiomas of different grade, in order to evaluate their possible role in the development of the disease. EGFR protein belongs to the family of tyrosine kinase growth factor receptors, which also includes HER2, HER3 and HER4. Elevated expression or activity of EGFR has been reported in several cancers, including brain tumours. EGFR activation can enhance the malignant potential of epithelial tissues.

METHODS

We investigated whether there was a difference in the EGFR protein expression and the EGFR gene amplification between the so called de novo malignant meningiomas and recurrent meningiomas with or without malignant progression from a previously lower grade tumor. Our goal was to evaluate if EGFR expression was a useful marker to select patients affected by meningioma with a major risk of recurrences. We also assessed the prognostic value of the EGFR expression on overall survival.

RESULTS

Progression from benign meningiomas to atypical or anaplastic meningiomas correlated with an increase in the expression of EGFR protein. Our study shows that EGFR immunostaining in meningiomas directly correlates to the tumor's grade. The EGFR expression did not correlate with the overall survival and the recurrence-free survival of the patients affected by meningioma (de novo, recurrent and progressed).

CONCLUSION

We submit that the EGFR expression is not a useful prognostic element to identify patients with a major risk of meningioma recurrence.

Isolated, benign, intraorbital schwannoma arising from the supraorbital nerve. Case report and review of the literature

The authors describe the rare case of a 65-year-old man, with absent clinical evidence of von Recklinghausen's disease, harbouring an isolated, benign schwannoma of the right supraorbital nerve. The patient presented a progressive, painless proptosis of the eye for the past 2 years, did not complain of any intra- or periorbital pain, and did not experience any form of visual disturbance or field defect. The lesion was completely resected using a fronto-orbitozygomatic approach. The clinicopathological, radiological and surgical features are discussed, and the literature on supraorbital nerve schwannomas reviewed. To the authors' knowledge the fronto-orbitozygomatic approach has not been previously reported for the removal of supraorbital nerve tumors.