Collision breast cancer and chronic lymphocytic leukemia/small lymphocytic lymphoma in a single lymph node (clinical case).

Collision synchronous tumors that are found at the same anatomical site are very rare. Their diagnostics, staging and treatment is very complicated. Here we present a clinical case of collision tumor in a single lymph node which consists of breast cancer and chronic lymphocytic leukemia/small lymphocytic lymphoma. The management of such cases is discussed.