68 Ga-DOTATATE and 18 F-FDG PET/CT in a Rapidly Progressing Lymphoma

Area of Science:

• Oncology
• Nuclear Medicine
• Radiology

Background:

• 68Ga-DOTATATE PET/CT targets somatostatin receptors, standard for neuroendocrine tumor imaging.
• Lymphomas can express somatostatin receptors, potentially leading to false positives.
• Atypical presentations require thorough diagnostic evaluation.

Purpose of the Study:

• To describe an unusual case of aggressive large B-cell lymphoma.
• To illustrate how this lymphoma mimicked metastatic neuroendocrine tumors on initial imaging.
• To highlight the diagnostic challenges posed by somatostatin receptor expression in non-neuroendocrine malignancies.

Main Methods:

• Utilized 68Ga-DOTATATE PET/CT for initial tumor imaging.
• Performed subsequent 18F-FDG PET/CT to assess disease progression.
• Analyzed clinical presentation and histopathological findings.

Main Results:

• Initial 68Ga-DOTATATE PET/CT showed high somatostatin receptor expression, suggestive of neuroendocrine tumors.
• The patient presented with an aggressive large B-cell lymphoma.
• Subsequent 18F-FDG PET/CT revealed a rapidly progressing disease course.

Conclusions:

• Aggressive large B-cell lymphoma can present atypically with high somatostatin receptor expression.
• 68Ga-DOTATATE PET/CT findings in lymphomas can mimic neuroendocrine tumors.
• Careful integration of imaging, clinical, and pathological data is crucial for accurate diagnosis and management.