Regarding chromosomal analysis for this patient, it was not performed primarily because the diagnosis of pulmonary MALT lymphoma had been sufficiently confirmed by the aforementioned comprehensive diagnostic workup including detailed histopathological examination (revealing dense angiocentric infiltration of atypical lymphoid cells), immunohistochemical profiling (e.g., strong membranous CD20 positivity, negative Cyclin D1, and intact follicular dendritic-cell meshwork via CD21/CD23), and molecular detection of monoclonal rearrangements of immunoglobulin genes (IgH and IgK) (10). Here, CR2 is linked to MALT lymphoma.