open access

Vol 68, No 3 (2017)
Case report
Published online: 2017-06-21
Submitted: 2016-04-12
Accepted: 2016-05-24
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All that glitters on PET is not cancer! 18F-deoxy-glucose avidity versus tumor biology: pituitary incidentaloma in a survivor of two previous unrelated malignancies

Dragana Miljić, Emilija Manojlović-Gačić, Milica Skender-Gazibara, Toplica Milojević, Vojislav Bogosavljević, Nebojša Kozarević, Nebojša Petrović, Marko Stojanović, Sandra Pekić, Mirjana Doknić, Milan Petakov, Vera Popović
DOI: 10.5603/EP.2017.0027
·
Endokrynologia Polska 2017;68(3):352-359.

open access

Vol 68, No 3 (2017)
Case report
Published online: 2017-06-21
Submitted: 2016-04-12
Accepted: 2016-05-24

Abstract

Introduction: 18F-deoxy-glucose positron emission tomography combined with computed tomography (18F-FDG PET/CT) is routinely used in the detection of malignant disease based on the property of malignant cells to fuel their growth and replication by increased glucose uptake. Malignant lesions are rare in the sellar region, while pituitary adenomas are the most common pathology. These are benign neoplasms with insidious onset and low proliferation activity, and therefore are only exceptionally detected by 18F-FDG PET/CT. Studies that compare the biology of pituitary adenomas and their radiological properties using PET/CT are still lacking.

Case report: We investigate and discuss tumour biology in light of increased 18F-FDG avidity in a symptom-free, 70-year-old male patient, previously treated for two different malignancies (lung and rectal). Increased tracer accumulation in the sellar region was incidentally detected on a follow-up 18F-FDG PET/CT scan. Additional MRI disclosed pituitary adenoma. Normal hormonal status was found, consistent with the diagnosis of non-functioning pituitary adenoma. Analysis of tumour tissue after pituitary surgery confirmed a silent gonadotroph adenoma with low proliferation index. Low expression of oncogene-induced senescence markers did not support senescence as the explanation for the tumour’s low proliferative activity although it was in consonance with the hormonal activity.

Conclusions: Pituitary adenomas can manifest as hypermetabolic foci on 18F-FDG PET/CT imaging with increased tracer uptake even in indolent, clinically silent pituitary adenomas with low mitotic activity. Special attention should be paid to evaluation of 18F-FDG avid pituitary adenomas in patients with multiple malignancies, bearing in mind that avidity does not always mirror its biological behaviour.

Abstract

Introduction: 18F-deoxy-glucose positron emission tomography combined with computed tomography (18F-FDG PET/CT) is routinely used in the detection of malignant disease based on the property of malignant cells to fuel their growth and replication by increased glucose uptake. Malignant lesions are rare in the sellar region, while pituitary adenomas are the most common pathology. These are benign neoplasms with insidious onset and low proliferation activity, and therefore are only exceptionally detected by 18F-FDG PET/CT. Studies that compare the biology of pituitary adenomas and their radiological properties using PET/CT are still lacking.

Case report: We investigate and discuss tumour biology in light of increased 18F-FDG avidity in a symptom-free, 70-year-old male patient, previously treated for two different malignancies (lung and rectal). Increased tracer accumulation in the sellar region was incidentally detected on a follow-up 18F-FDG PET/CT scan. Additional MRI disclosed pituitary adenoma. Normal hormonal status was found, consistent with the diagnosis of non-functioning pituitary adenoma. Analysis of tumour tissue after pituitary surgery confirmed a silent gonadotroph adenoma with low proliferation index. Low expression of oncogene-induced senescence markers did not support senescence as the explanation for the tumour’s low proliferative activity although it was in consonance with the hormonal activity.

Conclusions: Pituitary adenomas can manifest as hypermetabolic foci on 18F-FDG PET/CT imaging with increased tracer uptake even in indolent, clinically silent pituitary adenomas with low mitotic activity. Special attention should be paid to evaluation of 18F-FDG avid pituitary adenomas in patients with multiple malignancies, bearing in mind that avidity does not always mirror its biological behaviour.

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Keywords

pituitary adenoma; 18F-FDG PET/CT; immunohistochemistry

About this article
Title

All that glitters on PET is not cancer! 18F-deoxy-glucose avidity versus tumor biology: pituitary incidentaloma in a survivor of two previous unrelated malignancies

Journal

Endokrynologia Polska

Issue

Vol 68, No 3 (2017)

Pages

352-359

Published online

2017-06-21

DOI

10.5603/EP.2017.0027

Bibliographic record

Endokrynologia Polska 2017;68(3):352-359.

Keywords

pituitary adenoma
18F-FDG PET/CT
immunohistochemistry

Authors

Dragana Miljić
Emilija Manojlović-Gačić
Milica Skender-Gazibara
Toplica Milojević
Vojislav Bogosavljević
Nebojša Kozarević
Nebojša Petrović
Marko Stojanović
Sandra Pekić
Mirjana Doknić
Milan Petakov
Vera Popović

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