The lymphocytosis-promoting factor of Bordetella pertussis is a potent mitogen for murine lymphocytes in vitro. The stimulatory response was not the result of specific antigen stimulation. Spleen and lymph node cells were responsive, whereas normal thymocytes were unresponsive. However, DNA replication was induced in cortisone-resistant thymocytes by lymphocytosis-promoting factor (LPF). Bone m...

Correspondence: Lourdes Florensa, MD, Laboratori de Citologia Hematològica, Laboratori de Referència de Catalunya, Hospital de l’Esperança, Av. Sant Josep de la Muntanya 12, 08024 Barcelona, Spain. Phone: international +34-93-285.02.00 ext 2189-2243 – Fax: international +34-93-210.84.06 – E-mail: [email protected] A44-year-old female was referred for investigation of a 10-year persistent lymph...

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Persistent polyclonal B-cell lymphocytosis (PPBL) is a rare and recently described entity. The review of the literature show PPBL is diagnosed predominantly but not exclusively in women, usually smokers. PPBL is recognized by a moderate, chronic and absolute lymphocytosis (>4 × 10(9)/l) in the peripheral blood. In 10% of cases without lymphocytosis, the PPBL diagnosis has to be suggested by per...

TOPIC: Disorders of the Mediastinum TYPE: Medical Student/Resident Case Reports INTRODUCTION: The work-up anterior mediastinal masses (AMM) often warrants consideration malignant etiology. Certain imaging findings may reinforce need for diagnostic biopsy. Moreover, while AMMs disseminate to peripheral blood, incidental hematogenous malignancies also harbor in blood supply non-malignant AMM. CAS...

Monoclonal B-cell lymphocytosis (MBL) is a clonal B-cell disorder characterized by less than 5 × 109/L B lymphocytes in the peripheral blood, with a characteristic immunophenotype and no lymphadenopathy or organomegaly. The vast majority of MBL cases express the immunophenotype of chronic lymphocytic leukemia (CLL; CLL-like MBL), although non-CLL MBL also exists. CLL-like MBL, which is the focu...