ABSTRACT
Purpose: To evaluate the features of bone marrow (BM) biopsy involvement by lymphoma, pattern of infiltration, morphological analysis and flow cytometry were reviewed at all lymphoma patients over a period of 10 years. Methods/patients: 413 cases were included in the study if BM biopsy slides were available. Only 356 patients had both BM trephine biopsy and flow cytometry. Results: The most frequent subtype was diffuse large B cell (31.2 %), followed by follicular lymphoma (18.9 %). The predominant pattern was mixed (nodular-interstitial) (9.2 %). Morphological marrow infiltration was found in 138 cases, and flow cytometry identified 117 cases with BM involvement. A concordance between the two methods was detected in 305 cases (85.7 %). There was discordance in 51 cases (14.3 %): morphology positive/FC negative in 33 cases and morphology negative/FC positive in 18. Conclusions: Flow cytometry is slightly more useful in detecting involvement when the BM is affected, but this finding is not conclusive (AU)
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