Malignant lymphoma in Al-Qassim, Saudi Arabia, reclassified according to the WHO classification.

Objective: To determine the frequency of various types of malignant lymphoma (ML) in the Al-Qassim region of Kingdom of Saudi Arabia (KSA) according to recently introduced the WHO classification.

Methods: For this retrospective analysis, material was available in 385 out of 519 cases diagnosed as ML from 1988-2007. Morphological assessment was followed by immunohistochemistry using a panel of antibodies.