Updates in Immunohistochemistry for Hematopoietic and Lymphoid Neoplasms.

Context.—: In their 2014 article "New Immunohistochemistry for B-cell Lymphoma and Hodgkin Lymphoma," Zhang and Aguilera reviewed new immunohistochemical markers for B-cell lymphoma and Hodgkin lymphoma and described how to use these markers for correct lymphoma diagnoses, using the 2008 World Health Organization classifications. Recently, the World Health Organization's WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues published 2022 updates, and, in quick sequence, a second group published an alternative International Consensus Classification of myeloid neoplasms, acute leukemias, and mature lymphoid neoplasms.

Establishing Absolute Lymphocyte Count Thresholds for Further Review of Peripheral Blood Lymphocytosis to Judiciously Screen for Monoclonal B-Cell Populations in Older Adults.

Objectives: Lymphocytosis may represent either a lymphoproliferative disorder (LPD) or a reactive process. The absolute lymphocyte count (ALC) threshold for further evaluation of lymphocytosis is not well established.

Methods: We prospectively performed flow cytometry on blood samples from patients 50 years or older with ALCs of 4.

A Supraglottic Mass in a Pediatric Patient: An Unusual Presentation of Lymphoma.

Objective: To present a case of laryngeal lymphoma in a pediatric patient and perform a literature review of this rare entity.

Patient: A 13-year-old male presented with a rapidly enlarging right neck mass. Work-up of the neck mass included a computed tomography scan of the neck with contrast and revealed a 2.