| History (duration and presence of local or systemic symptoms) |
| Physical examination (careful evaluation of all lymph node regions, inspection of the upper airways and tonsils, clinical evaluation of the size of liver and spleen, detection of any palpable mass) |
| Laboratory tests, including complete blood counts and peripheral blood smear, LDH and β2-microglobulin levels, evaluation of renal and liver function |
| Bone marrow biopsy |
| Standard posteroanterior and lateral chest radiographs |
| Abdominal and pelvic computed tomography scan |
| Gastroduodenal endoscopy with multiple gastric biopsies from all the visible lesions and the noninvolved areas with a complete mapping of the organ |
| Gastric endoscopic ultrasound |
| History (duration and presence of local or systemic symptoms) |
| Physical examination (careful evaluation of all lymph node regions, inspection of the upper airways and tonsils, clinical evaluation of the size of liver and spleen, detection of any palpable mass) |
| Laboratory tests, including complete blood counts and peripheral blood smear, LDH and β2-microglobulin levels, evaluation of renal and liver function |
| Bone marrow biopsy |
| Standard posteroanterior and lateral chest radiographs |
| Abdominal and pelvic computed tomography scan |
| Gastroduodenal endoscopy with multiple gastric biopsies from all the visible lesions and the noninvolved areas with a complete mapping of the organ |
| Gastric endoscopic ultrasound |