One of the mysteries of the English language finally explained.
Any tumour composed of myoblasts (or cells believed to be myoblasts); especially (more fully "granular cell myoblastoma") a granular cell tumour, a histologically distinctive type of tumour, usually benign, found at various locations in the body and composed of large, uniform cells with abundant granular cytoplasm (now usually thought to be of Schwann cell origin).
1930s; earliest use found in American Journal Cancer. From myoblast + -oma, after German Myoblastenmyom.
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