SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 30 percent of the U.S. population.
PMBL most likely arises within the thymus. Patients present with a localized anterosuperior mediastinal mass. The mass is often bulky and frequently invades adjacent structures such as lungs, pleura, or pericardium. Spread to supraclavicular and cervical LN can occur.
Workup should be done to exclude a secondary mediastinal involvement by a DLBCL versus a primary mediastinal B-cell lymphoma through the absence of bone marrow involvement and lymph node involvement outside of the region.
Definitive Diagnostic Methods
Comparative genomic hybridzation (CH) demonstrated gains in chromosome 9p24 and 2p15