Prolymphocytic Leukemia

**Semantic type:** Neoplastic Process

**Definition:** A mature B- or T- cell leukemia with progressive clinical course. It is characterized by the presence of medium-sized lymphocytes with visible nucleoli (prolymphocytes) in the peripheral blood, bone marrow, and spleen.

**Synonyms:** - PLL - Prolymphocytic leukemia (B or T) - Prolymphocytic leukemia (B or T-cell) - prolymphocytic leukemia