Resemblance between pleuropulmonary blastoma and Askin-Rosai's tumor.

Adult pleuropulmonary blastoma is an uncommon mesenchymal tumor of the peri pheral lung parenchyma composed of undifferentiated cells. The differential diagnosis with Askin-Rosai's tumor, an extrapulmonary pleuroparietal neuro ectodermal tumor, may De a difficult task. We propose a similar therapeutic approach for these two malignant conditions. surgical excision associated with chemotherapy and autologous bone marrow transplant with adjuvant radio therapy in case of recurrence. These two entities have many epidemiological , clinical, histological and immunohistochemical similarities.