<prompt> Answer this question truthfullyWhat are Primary CNS lymphoma and Diffuse Large B-cell Lymphoma, and in what type of patients are they most commonly seen?  <response>: <reason> Primary CNS lymphoma and Diffuse Large B-cell Lymphoma are both types of cancer that affect the lymphatic system. They are most commonly seen in patients with HIVAIDS, although they can also occur in individuals with other types of immune system disorders or in those with no known underlying health conditions. Both types of lymphoma can cause a range of symptoms, including headaches, seizures, changes in vision or hearing, and cognitive or behavioral changes. Treatment for these conditions typically involves a combination of chemotherapy, radiation therapy, and other supportive measures to manage symptoms and improve outcomes. 