Myoblastoma

Abnormal growth of muscular tissue. The best-known is a uterine myoma (fibroid). Myoblastoma is also benign; this is a round tumour which can occur in the tongue or under the skin. Treatment, if desirable, is by surgical removal of the tumour. Rhabdomyosarcoma is a rare but highly malignant muscular tumour; it can occur in striated and cardiac muscle, but usually in the muscles of a limb or the buttocks. It grows extremely rapidly, and can achieve a size of 25 centimetres. The prognosis is bad, even under such drastic treatment as the amputation of limbs, because the tumour metastasizes rapidly, especially to the lungs and bones. Tumours originating in connective tissue also occur in muscles; they include the benign fibroma and the malignant fibrosarcoma. Swellings in muscle may have another cause, such as injury to or haemorrhage in the muscle, which may resemble a tumour from the outside. Scars may form after haemorrhage, and muscular tissue may also be replaced by connective tissue after muscular inflammation. Sometimes calcium is deposited in connective tissue, causing a bony swelling. Shrinkage of connective tissue can also result in irregular contractures. Treatment of the latter conditions is by surgical removal of connective tissue from the muscle. Muscular pain. It is a symptom associated with various conditions, but the most common cause is muscular strain. The immediate source is large quan-

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