Conclusions Bortryoid rhabdomyosarcoma, a low potential malignancy tumor, is more often seen in children's low organs.

Conclusions Squamoid eccrine ductal carcinoma is an exceedingly rare low-grade malignant tumor and can recur after excision but do not metastasize.

According to clinical data and the literatures review, the authors consider that this disease is one kind of primary bronchial low grade malignant tumors and surgical operation is only effective tr...