The epidemiology of non-Hodgkin's lymphoma: Comparison of nodal and extranodal
Lymphomas are malignant transformations of normal lymphoid cells that reside predominantly in lymphoid tissues such as lymph nodes as well as extranodal
sites such as stomach, thyroid, and bone.
Final tissue diagnosis revealed the mass to be an extranodal
marginal zone B-cell lymphoma of mucosa-associated lymphoid tissue (MALT) that was CD20 and BCL2 positive (Fig.
Conclusiones: El linfoma extranodal
renal es una entidad patologica de rara presentacion, clinicamente cursa con signos muy similares a otras alteraciones tumorales, su diagnostico suele ser histopatologico.
Las formas ALK negativas tienen un compromiso similar, pero el compromiso extranodal
es menos frecuente (1).
A lymph node biopsy showed an extranodal
marginal zone B-cell lymphoma of mucosa-associated tissue.
The gastrointestinal tract is a common site of extranodal
disease in AIDS-related lymphomas, affecting 17%-28% of cases.
Many of these tumors present with extranodal
disease, sometimes at unusual sites with bone marrow (30%), meninges (10%-20%) and gastrointestinal tract (10%-25%) being most common.
3-6 There is association of increased risk for developing CNS relapse in patients with elevated LDH, [greater than or equal to]2 extranodal
sites and involvement of specific extranodal
sites (testes, paranasal sinus, breast and bone marrow) on initial presentation.
The remaining one third of NHL cases has been reported in the extranodal
sites, including the gastro intestinal tract, Waldeyer's ring, bone, skin, and brain.
from Riyadh, KSA, studied the pattern of extranodal
NHL and reported that gastrointestinal (GI)NHL was the most frequent extranodal
NHL and stomach accounted for more than 81% of all GI NHL cases.
Nasal type extranodal
natural killer (NK)/T-cell lymphoma (ENKL) is a rare lymphoma associated with Epstein-Barr virus (EBV), which is more common in East Asia than in the West.