Submitted by Ahmad Alkhasawneh

Aggressive tumor

74-year-old man with abdominal pain, inguinal lymphadenopathy and mesenteric mass. Inguinal lymph node biopsy was performed. ##Note: Subclassification is required. Work up (including immunohistochemistry on tissue, flow cytometry, karyotype, FISH, and molecular), and flow cytometry guide are available under "specials to order".