Benign granular cell myoblastoma of tongue; report of case.
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The inflammatory myofibroblastic tumour of the bladder is a rare benign affection that interests mainly young adults. Its etiopathogeny remains unknown, but its tumoral origin was evocated recently by Griffin (1999), incriminating a chromosomic abnormality involving the ALK gene. We will discuss the etiopathogenic, anatopathological and therapeutical aspects of this lesion for which the diagnosis is histological and the treatment remains conservative with a good prognosis.
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Two patients with multiple granular cell tumours (GZTs) of the skin and one patient with GZT of the tongue are reported. The tumours had been becoming larger for several years without subjective symptoms. Only the GZT of the tongue was diagnosed correctly before surgery; the cutaneous GZTs were identified only at histological examination. Benign GZTs reveal similar histomorphological features. In contrast, immunohistochemical studies yield conflicting results. Thus, cellular differentiation of GZT is still controversial. On current evidence, GZTs represent a distinct entity with a common histogeneis. The most widely accepted theory is that they originate from a cell in the peripheral nerve system, which has not yet been more precisely characterized.