- Non-functional Pituitary Adenoma Detected on (18)F-fluorodeoxyglucose Positron Emission Tomography ((18)F-FDG-PET) in a Patient with Mucosa-associated Lymphoid Tissue Lymphoma.
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Jin Ha Lee, Seung Jin Han, Se Eun Park, Mi Ae Cho, June Won Cheong, Mijin Yun, Yumie Rhee, Eun Jig Lee, Sung Kil Lim
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J Korean Endocr Soc. 2008;23(2):137-141. Published online April 1, 2008
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DOI: https://doi.org/10.3803/jkes.2008.23.2.137
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 Abstract
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- Magnetic resonance imaging (MRI) is the modality of choice for the detection and characterization of a pituitary adenoma. Uptake of (18)F-fluorodeoxyglucose (FDG) by intrasellar tumors, including pituitary adenomas, has been reported in several previous studies. We report a case where a pituitary adenoma was detected on FDG-positron emission tomography (PET), but the tumor was not detected with the use of sellar MRI. A 31-year-old woman was referred to the clinic due to a focal increase of FDG uptake at the pituitary fossa seen on whole body FDG-PET. The patient was receiving chemotherapy due to a recurred B-cell lymphoma of the mucosa-associated lymphoid tissue type. Subsequently, sellar MRI was performed, and images showed a small non-enhancing heterogenous cystic lesion in the midline of the pituitary gland, radiologically suggestive of a Rathke's cleft cyst. However, sellar MRI failed to identify a lesion consistent with a pituitary tumor that corresponded to the site of increased FDG uptake detected by the use of PET, despite the inclusion of a dynamic contrast enhanced sequence. Despite the negative findings of the MRI examination, basal and stimulated levels of the GnRH free alpha-subunit were profoundly increased. Therefore, we suspected the presence of a non-functional pituitary tumor in addition to a Rathke's cleft cyst, rather than pituitary involvement of a lymphoma, based on the hormone levels and PET scan findings.
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Citations
Citations to this article as recorded by  - Clinical Characteristics of 16 Patients with Pituitary Tumor Incidentally Detected by18F-Fluorodeoxyglucose PET-CT (18F-FDG PET-CT)
Hyung Jin Kim, Gi Jeong Cheon, A Ra Cho, Chang Hoon Lee, Sang Min Youn, Se jin Ahn, Sang Eon Jang, Jung Min Kim, Yun Yong Lee, Ka Hee Yi
Endocrinology and Metabolism.2010; 25(4): 321. CrossRef
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