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Spinal melanotic schwannoma: a tumour with poor prognosis
Author(s) -
Anne-Valérie Vallat-Decouvelaere,
Michel Wassef,
Guillaume Lot,
Martin Catala,
M Moussalam,
N Caruel,
J. Mikol
Publication year - 1999
Publication title -
histopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.626
H-Index - 124
eISSN - 1365-2559
pISSN - 0309-0167
DOI - 10.1046/j.1365-2559.1999.00786.x
Subject(s) - medicine , schwannoma , malignancy , atypia , lesion , metastasis , pathology , immunohistochemistry , cancer
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.