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Figure 4: (a) A fifty-year-old female patient with histologically verified diffuse large B-cell lymphoma and who was Stage IV. 18F-fluorodeoxyglucose positron emission tomography/computed tomography (left) demonstrates hypermetabolic lymph nodes with biopsy-proven diffuse large B-cell lymphoma and right groin region with maximum standardized uptake value 28.1. Ki-67 immunohistology (right) with hematoxylin-eosin section at ×400 magnification was expressed in 90% of B-cells. (b) A sixty-eight-year-old female with immunohistochemical studies confirmed the diagnosis of follicular lymphoma, showing that the lymphocytes are B-cells (CD20+). 18F-fluorodeoxyglucose positron emission tomography/computed tomography (left) images of the patient with Stage I follicular lymphoma and International Prognostic Index score showed low risk. Maximum standardized uptake value of the biopsy site on positron emission tomography/computed tomography was 1.8. Ki-67, the proliferation antigen, was expressed in 10% (right)

Figure 4: (a) A fifty-year-old female patient with histologically verified diffuse large B-cell lymphoma and who was Stage IV. <sup>18</sup>F-fluorodeoxyglucose positron emission tomography/computed tomography (left) demonstrates hypermetabolic lymph nodes with biopsy-proven diffuse large B-cell lymphoma and right groin region with maximum standardized uptake value 28.1. Ki-67 immunohistology (right) with hematoxylin-eosin section at ×400 magnification was expressed in 90% of B-cells. (b) A sixty-eight-year-old female with immunohistochemical studies confirmed the diagnosis of follicular lymphoma, showing that the lymphocytes are B-cells (CD20+). <sup>18</sup>F-fluorodeoxyglucose positron emission tomography/computed tomography (left) images of the patient with Stage I follicular lymphoma and International Prognostic Index score showed low risk. Maximum standardized uptake value of the biopsy site on positron emission tomography/computed tomography was 1.8. Ki-67, the proliferation antigen, was expressed in 10% (right)