Pulmonary leiomyomatosis in women after hysterectomy for uterine myoma. Benign metastasizing leiomyoma?

INTRODUCTION: Leiomyomas, which usually occur multilocular in uterus, can develop even if rarely in other organs with smooth muscle cells. The tumour is considered benign; 2 case reports supports the hypothesis that uterus myoma could metastasize, and in the metastasis sites grow invasively.
METHODS: 2 female patients 44 y. and 29 y. old were admitted to our clinic for MPL. Due to increasing tumor size respectively dypnea, they were operated on. Multiple nodules of the left lung in one case, and a mediastinal tumour in the other were resected; resected tumour was histologically examined.
RESULTS: In both cases it was a matter of well-differentiated leiomyosarcoma. The mediastinal tumour has already invade the N. phrenicus. Postoperatively there were no complications. Patients discharged in well-doing state, medical control one year later revealed no new growth.
CONCLUSION: Multiple pulmonary leiomyomas are rare, they occur in sexually mature women in coincidence with uterus myoma. Even though many authors assume that MPL is a lung metastasis of benign tumours, the pathogenesis is still hypothetical. Supporting this thesis is the hormone dependence of both the uterine and the pulmonary tumours; against it, is that extrapulmonary locations are too rarely observed. The still open pathogenetical question has no therapeutical consequence. Whenever technically possible, a radical, parenchyma-saving surgical therapy should be the first choice. Otherwise hormon-ablation is a good alternative.