Abstract:
AIM:To clarify the prognosis of melanotic schwannoma. This is a rare tumour which is generally considered as a benign lesion, reported in many cases with a short follow-up only. METHODS AND RESULTS:Five cases of spinal melanotic schwannoma were retrospectively studied. The tumours were examined using standard histological, immunohistochemical and ultrastructural methods. No features of malignancy (high mitotic count, atypia or necrosis) were found in the primary tumours. The follow-up period ranged from 3 to 7 years. Malignant clinical behaviour was clear-cut in four cases: three patients died from metastases to various sites and one presented several discrete spinal tumours of the same type seven years after the first operation. Only one patient presented no recurrence and was free of disease 6 years after initial diagnosis. The review of 57 cases of the literature (including our cases), showed that 15% of the cases had recurrences and 26.3% were complicated by metastasis. Only 53% of the cases followed for more than 5 years, were free of disease vs. 67.5% of the cases with shorter follow-up. Twenty additional cases had no follow-up. CONCLUSION:Appropriate long-term follow-up is required for all melanotic schwannomas, as it may recur or metastasize after more than 5 years, even in the absence of overt malignant histological features.
journal_name
Histopathologyjournal_title
Histopathologyauthors
Vallat-Decouvelaere AV,Wassef M,Lot G,Catala M,Moussalam M,Caruel N,Mikol Jdoi
10.1046/j.1365-2559.1999.00786.xkeywords:
subject
Has Abstractpub_date
1999-12-01 00:00:00pages
558-66issue
6eissn
0309-0167issn
1365-2559pii
his786journal_volume
35pub_type
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