Incidental Mammary Fibromyoblastoma on 82 Rb Myocardial Perfusion Imaging Matthieu Pelletier-Galarneau, MD, MSc,* Patrick Martineau, MD, PhD,* and Ross A. Davies, MD, FRCPC, FACC† Abstract: 82 Rb is frequently used in PET myocardial perfusion imaging to detect ischemia. We present the case of a 64-year-old man referred for PET myocardial perfusion imaging to rule out ischemia. On PET images, an abnormal focus of up- take was present in the subcutaneous soft tissue overlying the right chest, which corresponded to a soft-tissue nodule on CT. This lesion was biopsied and proved to be a mammary fibromyoblastoma, an extremely rare and benign lesion. This case is presented to emphasize the importance of reviewing extracardiac struc- tures on PET/CT myocardial perfusion studies. (Clin Nucl Med 2014;00: 00–00) REFERENCES 1. Baggish AL, Boucher CA. Radiopharmaceutical agents for myocardial perfusion imaging. Circulation. 2008;118:1668–1674. 2. Sehweil AM, McKillop JH, Milroy R, et al. Mechanism of 201 Tl uptake in tumours. Eur J Nucl Med. 1989;15:376–379. 3. Carli MFD, Dorbala S, Meserve J, et al. Clinical myocardial perfusion PET/CT. J Nucl Med. 2007;48:783–793. 4. Mirpour S, Khandani AH. Extracardiac abnormalities on rubidium-82 cardiac pos- itron emission tomography/computed tomography. Nucl Med Commun. 2011;32: 260–264. 5. Wargotz ES, Weiss SW, Norris HJ. Myofibroblastoma of the breast. Sixteen cases of a distinctive benign mesenchymal tumor. Am J Surg Pathol. 1987;11:493–502. 6. Kataria K, Srivastava A, Singh L, et al. Giant myofibroblastoma of the male breast: a case report and literature review. Malays J Med Sci. 2012;19:74–76. 7. Klocke FJ, Baird MG, Lorell BH, et al. ACC/AHA/ASNC guidelines for the clin- ical use of cardiac radionuclide imaging—executive summary: a report of the American College of Cardiology/American Heart Association Task Force on Prac- tice Guidelines (ACC/AHA/ASNC Committee to Revise the 1995 Guidelines for the Clinical Use of Cardiac Radionuclide Imaging). Circulation. 2003;108: 1404–1418. 8. Strauss HW, Miller DD, Wittry MD, et al. Procedure guideline for myocardial per- fusion imaging 3.3. J Nucl Med Technol. 2008;36:155–161. Received for publication June 26, 2014; revision accepted October 24, 2014. From the *Division of Nuclear Medicine, University of Ottawa; and †Division of Car- diology, University of Ottawa Heart Institute, Ottawa, Ontario, Canada. Conflicts of interest and sources of funding: none declared. Reprints: Matthieu Pelletier-Galarneau, MD, MSc, Division of Nuclear Medi- cine, Ottawa Hospital, University of Ottawa, General Campus, 501 Smyth Rd, Ottawa, Ontario, Canada K1H 8 L6. E-mail: mapelletier@toh.on.ca. Copyright © 2014 by Lippincott Williams & Wilkins ISSN: 0363-9762/14/0000–0000 INTERESTING IMAGE Clinical Nuclear Medicine • Volume 00, Number 00, Month 2014 www.nuclearmed.com 1 Copyright © 2014 Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited.