Indian Journal of Nuclear Medicine
Home | About IJNM | Search | Current Issue | Past Issues | Instructions | Ahead of Print | Online submissionLogin 
Indian Journal of Nuclear Medicine
  Editorial Board | Subscribe | Advertise | Contact
Users Online: 945 Print this page  Email this page Small font size Default font size Increase font size


 
 Table of Contents     
CASE REPORT
Year : 2015  |  Volume : 30  |  Issue : 2  |  Page : 151-153  

Paget's disease of pelvis mimicking metastasis in a patient with lung cancer evaluated using staging and follow-up imaging with fluorine-18 fluorodeoxyglucose-positron emission tomography/computed tomography


1 Department of Nuclear Medicine, PET/CT and Radionuclide Therapy, Comprehensive Cancer Care Centre, Kovai Medical Centre and Hospital Limited, Coimbatore, Tamil Nadu, India
2 Department of Medical Oncology, Comprehensive Cancer Care Centre, Kovai Medical Centre and Hospital Limited, Coimbatore, Tamil Nadu, India

Date of Web Publication11-Mar-2015

Correspondence Address:
Dr. Koramadai Karuppusamy Kamaleshwaran
Department of Nuclear Medicine, PET/CT and Radionuclide Therapy, Comprehensive Cancer Care Centre, Kovai Medical Centre and Hospital Limited, Coimbatore - 641 014, Tamil Nadu
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-3919.152980

Rights and Permissions
   Abstract 

Paget's disease of bone is a benign disease, of uncertain etiology, characterized by an accelerated turnover, that is, bone resorption and formation. Paget's disease may be present in up to 5% of the population, and the majority of cases are asymptomatic. We report the imaging findings of Paget's disease of pelvis discovered incidentally in patient with lung cancer evaluated by fluorine-18-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) for staging. FDG PET-CT scan showed intense uptake in the right lung lower lobe primary and mediastinal lymph nodes. Furthermore, increased uptake noted in left hemipelvis suggestive of Paget's disease. He underwent follow-up FDG PET-CT after chemotherapy showed decrease in lung mass and mediastinal nodes. However, the uptake in left hemipelvis remains same confirming Paget's disease.

Keywords: Fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography, lung cancer staging, Paget′s disease, pelvis


How to cite this article:
Kamaleshwaran KK, Natarajan S, Shibu D, Malaikkal A, Shinto AS. Paget's disease of pelvis mimicking metastasis in a patient with lung cancer evaluated using staging and follow-up imaging with fluorine-18 fluorodeoxyglucose-positron emission tomography/computed tomography. Indian J Nucl Med 2015;30:151-3

How to cite this URL:
Kamaleshwaran KK, Natarajan S, Shibu D, Malaikkal A, Shinto AS. Paget's disease of pelvis mimicking metastasis in a patient with lung cancer evaluated using staging and follow-up imaging with fluorine-18 fluorodeoxyglucose-positron emission tomography/computed tomography. Indian J Nucl Med [serial online] 2015 [cited 2019 Dec 15];30:151-3. Available from: http://www.ijnm.in/text.asp?2015/30/2/151/152980


   Introduction Top


Paget's disease is a chronic bone disorder characterized by focal areas of excessive osteoclastic resorption accompanied by a secondary increase in osteoblastic activity, resulting in abnormal bone structure, bone expansion, and deformity. [1] Scintigraphy using either Tc99m-methylene diphosphonate or fluorine-18 (F-18) fluoride is the most useful method of detecting pagetic lesions. [2] Additional plain radiographs are obtained to characterize lesions detected by scintigraphy. Paget's disease when associated with malignancy may pose diagnostic dilemma. We report the imaging findings of a patient with Paget's disease in carcinoma lung who underwent during staging and follow-up imaging using F-18-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT).


   Case Report Top


A 65-year-old male patient diagnosed to have right lower lobe lung adenocarcinoma was referred for FDG PET/CT for staging evaluation. FDG PET-CT showed intense tracer uptake in the right lower lobe lung lesion along with multiple mediastinal and right supraclavicular lymph nodes [Figure 1].
Figure 1: Whole body fluorodeoxyglucose-positron emission tomography/ computed tomography (FDG PET/CT) maximum intensity projection image showing primary right lower lobe lung mass and mediastinal, right supraclavicular nodes. Furthermore, diffuse increased uptake in left hemipelvis noted (Paget's disease)

Click here to view
Furthermore, increased tracer uptake noted in the entire left hemipelvis with a maximum standardized uptake value (SUVmax) of 5.3. CT showed cortical thickening, intra trabeculation with course thick trabeculae, bone expansion, and multiple areas of sclerosis, consistent with Paget's disease [Figure 2]. The level of alkaline phosphatase (ALP) was 456 IU/l. He underwent follow-up FDG PET-CT after three cycles of chemotherapy showed intense FDG uptake with decrease in size and metabolism of the lung primary and mediastinal nodes with complete response in supraclavicular and some mediastinal nodes. But left hemipelvis uptake remains same, and he was asymptomatic for Paget's disease [Figure 3].
Figure 2: Axial computed tomography of the pelvis showing left ilium cortical thickening, intra trabeculation with course thick trabeculae, bone expansion, and multiple areas of sclerosis, consistent with Paget's disease

Click here to view
Figure 3: Whole body fluorodeoxyglucose-positron emission tomography/ computed tomography (FDG PET/CT) maximum intensity projection image showing decrease in primary right lower lobe lung mass and mediastinal nodes. Diffuse increased uptake in left hemipelvis remains unchanged (Paget's disease)

Click here to view



   Discussion Top


Paget's disease is a disorder of unknown etiology with unevenly increased osteoclastic and osteoblastic skeletal remodeling. Bone involvement may be monostotic or polyostotic with characteristic radiographic features of osseous enlargement, deformity, and trabecular thickening. Paget's disease have a male predominance and increasing frequency related to age. [3] There is a rise in serum ALP and abnormal remodeling of bone, leading to characteristic radiograph appearances of "cotton wool" appearance of the skull, "ivory" vertebra, and "blade of grass" shape in long bones. [2],[4] FDG-PET is a tomographic technique, with superior spatial resolution compared with a bone scan, with the added ability to quantitatively measure (SUVmax) disease activity, and monitor the response to treatment. [5] The role of FDG-PET in Paget's disease is not as yet well-elucidated. It is unclear whether Paget's disease may lead to false-positive findings in oncological patients, or if FDG-PET can reliably differentiate benign pagetoid changes from metastatic and sarcomatous changes of bone. Some studies have concluded that Paget's disease is not associated with FDG uptake in most of the cases, but FDG uptake may be seen in patients with more active disease. [6],[7]

Previous reports of increased tracer uptake in Paget's disease mimicking metastasis ina case of malignant mesothelioma and rectal cancer have been reported. [8],[9] We describe a case of increased FDG activity in pagetoid pelvis in lung cancer patient detected incidentally using PET/CT. The intense FDG focal uptake in the left hemipelvis lesion on FDG-PET in our case is a possibility of false positive findings in patients with cancer. [10] Fused PET/CT images can add increased specificity in the characterization of an osseous lesion when compared with stand-alone PET by differentiating between the exact location of FDG uptake in these lesions. In general, cortical distribution of FDG uptake is more frequently seen in Paget's disease, and a medullary distribution of FDG uptake is more often associated with osseous metastases. [8]

Computed tomography correlation may often improve the diagnostic accuracy of nonspecific FDG uptake in some patients, with the potential for discriminating between benign Paget's disease and associated sarcomas. Coregistered PET/CT data may obviate the need for further evaluation or biopsy, as in our case, especially when CT scan findings are characteristic for Paget's disease. Follow-up imaging was helpful as lung primary and nodes were responding to the chemotherapy but the pelvic lesion remains same confirming unrelated to lung cancer as Paget's disease of pelvis.

 
   References Top

1.
Selby PL, Davie MW, Ralston SH, Stone MD, Bone and Tooth Society of Great Britain, National Association for the Relief of Paget's Disease. Guidelines on the management of Paget's disease of bone. Bone 2002;31:366-73.  Back to cited text no. 1
    
2.
Vellenga CJ, Bijvoet OL, Pauwels EK. Bone scintigraphy and radiology in Paget's disease of bone: A review. Am J Physiol Imaging 1988;3:154-68.  Back to cited text no. 2
    
3.
Smith SE, Murphey MD, Motamedi K, Mulligan ME, Resnik CS, Gannon FH. From the archives of the AFIP. Radiologic spectrum of Paget disease of bone and its complications with pathologic correlation. Radiographics 2002;22:1191-216.  Back to cited text no. 3
    
4.
Cook GJ, Maisey MN, Fogelman I. Fluorine-18-FDG PET in Paget's disease of bone. J Nucl Med 1997;38:1495-7.  Back to cited text no. 4
    
5.
Larson SM, Schwartz LH. 18F-FDG PET as a candidate for "qualified biomarker": Functional assessment of treatment response in oncology. J Nucl Med 2006;47:901-3.  Back to cited text no. 5
    
6.
Schajowicz F, Velan O, Santini Araujo E, Plantalech L, Fongi E, Ottolenghi E, et al. Metastases of carcinoma in the pagetic bone. A report of two cases. Clin Orthop Relat Res 1988;???: 290-6.  Back to cited text no. 6
    
7.
Chakraborty D, Mittal BR, Kamaleshwaran KK, Kashyap R, Bhattacharya A, Kumar S. Urinary bladder carcinoma associated with Paget's disease of skull: Imaging findings on Tc99m-MDP bone scintigraphy, F18-Fluoride PET/CT and F18-FDG PET/CT. Indian J Nucl Med 2011;26:42-3.  Back to cited text no. 7
[PUBMED]  Medknow Journal  
8.
Mahmood S, Martinez de Llano SR. Paget disease of the humerus mimicking metastatic disease in a patient with metastatic malignant mesothelioma on whole body F-18 FDG PET/CT. Clin Nucl Med 2008;33:510-2.  Back to cited text no. 8
    
9.
Mena LM, Hernández AC, Gallego M, Martínez T, Contreras JF. Incidental detection of Paget disease on 18F-FDG PET/CT scan in a patient with rectal cancer. Rev Esp Med Nucl Imagen Mol 2013;32:117-8.  Back to cited text no. 9
    
10.
Metser U, Even-Sapir E. Increased (18) F-fluorodeoxyglucose uptake in benign, nonphysiologic lesions found on whole-body positron emission tomography/computed tomography (PET/CT): Accumulated data from four years of experience with PET/CT. Semin Nucl Med 2007;37:206-22.  Back to cited text no. 10
    


    Figures

  [Figure 1], [Figure 2], [Figure 3]



 

Top
  
 
  Search
 
  
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
    Abstract
   Introduction
   Case Report
   Discussion
    References
    Article Figures

 Article Access Statistics
    Viewed1508    
    Printed21    
    Emailed0    
    PDF Downloaded87    
    Comments [Add]    

Recommend this journal