Small cell osteosarcoma is a rare sub-type of osteogenic malignant tumors. Rib localization is uncommon. Histological examination is an important step to make the difference with similar tumors like Ewing sarcoma. Surgical resection is the unique curative treatment. Prognosis remains poor even with adjuvant treatment

The sternum is an exceptional localization for Diffuse Large B Cells Lymphoma. A Case of a man with a sternal mass that mimics a sarcoma on the CT scan. Needle biopsy was not contributive. Surgical resection was indicated because of a local progression. Histopathological examination concluded to a primary DLBCL