This report deals with 3 autopsy cases of 4 years girl, 18 years male and 14 years boy, succumbed to alveolar rhabdomyosarcoma, originating in the nasal cavity, paranasal ninus and right forearm respectively. On section, wide spread metastasis were found in the lungs, pancreas, liver, spleen, kidneys, heart, adrenal glands, ovaries, fronto-parietal region, ribbs, vertebrae and lymphnodes. Biopsy specimens were removed repeatedly from original and metastatic tumors. Original diagnosis were nonepithelial malignant tumor (case 1), epithelial malignant tumor (case 2) and small cell sarcoma (case 3) respectively. Although the diagnosis was done in the case 2 and 3 histologically during their lives, the case 1 was diagnosed with fifficulty after the autopsy. Histologically characteristic pseudo-alveolar pattern was predominant in all cases. In the cases 2 and 3, the typical longitudinal and cross striations were obviously demonstrated in racket and tadpole cells.
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