INTRODUCTION

Von Recklinghausen's disease is characterized by the presence of cafe-au-lait spots, multiple neurofibromas and hamartomas. It is a dominant autosomal disease with high penetrance and variable expression, involving the head and neck in 22 to 47% of the patients. It is known as type I neurofibromatosis, in order to differentiate it from central involvement, especially that of the eight cranial nerve (acoustic neuroma - type 2 neurofibromatosis) 1,2.

Malignant transformation varies between 2% and 40%, and these patients are more prone to having malignant tumors of the nervous tissues and other secondary neoplasias1. They tend to appear in young patients in the middle of their bodies, and these patients run a high risk of having the tumors turn malignant - of worse prognoses and happening earlier on when compared to neurofibromas alone1,3,4.

Malignancy must be suspected when there is a fast growing and painful mass, investigated by image exams (CT, MRI, Bone Scintigraphy and Angiography) for staging, resection evaluation and lesion biopsy purposes3. Benign lesions can also show fast growth3,5.

Clinical development is characterized by local recurrences, and has poor prognosis in patients with multiple neurofibromatosis, and the lungs are frequently the seat of distant metastasis4.

Treatment is based on radiotherapy, chemotherapy and surgery; it bears a low 3-year survival rate4.


CASE REPORTS

Case 1

C.E.R., 37 years, single, Caucasian, with previous diagnosis of von Recklinghausen's disease and a history of a fast-growing mass in the right supraclavicular fossa for one year (Fig. 1). Physical exam: 15 cm nodular, hard, apparently well outlined, painful at palpation lesion, not adhered to the deep planes. The patient was submitted to surgery, and a tumor was found adhered to the clavicle periosteum and to the brachial plexus. We carried out a radical neck lymph node resection. Macroscopic aspect: nodular lesion, of 9x8x7 cm, cross-sections with cystic and solid white-yellowish soft areas.




Microscopy: malignant mesenchymal tumor made up of ovoid and spindle-like core cells, coated by an elongated cytoplasm, creating multidirectional bundles, with a moderate mitotic index, with hypercellularity and necrotic areas.

Diagnostic assumption: high grade spindle-cell sarcoma. Submitted to radiotherapy. The patient developed pain and a nodule in the right neck region. A new CT scan indicated lesion without vascular invasion and a nodule near the lung dome (probable recurrence). Submitted to palliative chemotherapy.

Case 2

U.G.P., 39 years old, Caucasian, neck tumor for 6 months; we noticed a neck enlargement with bilateral masses that pushed the larynx to the right, almost extreme lateral. A patient with von Recklinghausen's disease already submitted to resection of nodules in the chest and left shoulder. MRI showed a large solid neck tumor on the left side - compressing vessels, the larynx and trachea to the right side, all the way to the upper and anterior mediastinum, and large neck neuromas, larger on the left side. Nasal fibroscopy showed left vocal fold paralysis. The patient was taken to palliative surgery, in an attempt to decompress the trachea and avoid invasion of the large vessels. Macroscopically the lesion had 15.5 cm and weighed 350g. Histopathology: high grade spindle-cell sarcoma (malignant schwannoma). Immunohistochemistry test showed sarcoma.


DISCUSSION

Pain and fast growth associated with neurofibromas leads us to suspect of sarcomatous transformation, although it can be a benign lesion5. In a study with 165 patients with malignant schwannomas (neurilemoma), no association was found between the disease and the use of tobaco4.

The cases reported are of patients with von Recklinghausen's disease, aged between 37 and 40 years, males, non-smokers, with a fast growth lesion in the neck and supraclavicular regions.

Diagnostic investigation was carried out by image exams (CT, MRI and nasal fibroscopy) and histopathology.

Surgery was carried out, resecting the lesions and involved adjacent structures, added to adjuvant radio and/or chemotherapy.

Both cases were diagnosed and treated in a late stage, thus, unfortunately being of palliative nature only.


FINAL REMARKS

These patients must be continuously followed up because of the possibility of the patient developing metastatic disease, especially in the lung, and have local recurrence.


REFERENCES

1. Hasegawa M, Tanaka H, Watanabe I, Uehara T, Nasu M. Malignant Schwannoma and Follicular Thyroid Carcinoma Associated with von Recklinghausen's Disease. J Laryngol Otol 1984; 98:1057-61.

2. Halliday AL, Sobel RA, Martuza RL. Benign Spinal Nerve Sheath Tumors: Their Occurrence Sporadically and in Neurofibromatosis Types 1 and 2. J Neurosurg 1991;74:248-53.

3. Menendez L, Dicesare PE, Soto C. Neurofibroma in a Patient with von Recklinghausen`s Disease Seen as a Malignant Schwannoma. A case report. Clin Orthoped Rel Res 1990;254:298-302.

4. Sordillo PP, Helson L, Hajdu SI, Magill GB, Kosloff C, Golbey RB, Beattie EJ. Malignant Schwannoma - Clinical Characteristics, Survival, and Response to Therapy. Cancer 1981;47:2503-9.

5. Krumerman MS, Stingle W. Synchronous Malignant Glandular Schwannomas in Congenital Neurofibromatosis. A Case Report. Cancer 1978;41:2444-51.








1 MD. ENT Resident - Núcleo De Otorrino BH.
2 MD. ENT Resident - Núcleo De Otorrino BH.
3 MD. ENT Resident - Núcleo De Otorrino BH.
4 MD. Otorhinolaryngologist.
5 MSc. Otorhinolaryngologist and Head and Neck Surgeon, ENT preceptor - Santa Casa de BH and Núcleo de Otorrino BH. Núcleo de Otorrino BH.
Send correspondence to: Vinicius Antunes Freitas - Av. do Contorno 1298/901 B. Floresta BH MG 30110-008.
This paper was submitted to the RBORL-SGP (Publishing Manager System) on 19 March 2007. code 3783.
The article was accepted on 18 December 2007.