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Breast Mass on Mammography Breast Mass on Mammography Bobbi Pritt, MD ©2014 MFMER | slide-1 Clinical Presentation • 68 year old woman was noted to have 2 adjacent masses in the right breast on screening mammography • Well-circumscribed, lobulated, and measured 1.8 x 1.7 x 1.0 in aggregate • The masses increased in size over a 6-month follow-up interval, prompting surgical removal ©2014 MFMER | slide-2 ©2014 MFMER | slide-3 H&E 20x H&E 40x H&E 100x H&E 200x H&E 400x Diagnosis? ©2014 MFMER | slide-10 Sparganosis • Infection caused by species of cestodes (tapeworms) in the Spirometra genus • S. mansoni, S. ranarum, S. mansonoides, S. erinacei, S. proliferum • First described by Patrick Manson from China in 1882 • Spirometra is in the order Pseudophyllidea • Order includes Diphyllobothrium latum ©2014 MFMER | slide-11 Pseudophyllidea Cyclophyllidea • Diphyllobothrium latum(and • Taenia solium other Diphyllobothrium spp.) • Taenia saginata • Spirometra species • Dipylidium caninum • Hymenolepis nana • Hymenolepis diminuta • Echinococcus species ©2014 MFMER | slide-12 Humans are an incidental parentenic or second intermediate host ©2014 MFMER | slide-13 Humans as an Intermediate Host • We are host to the larval stage of the cestode • Other larval cestodes found in humans: • Taenia solium (cysticercosis) • Taenia multiceps and T. serialis (coenurosis) • Echinococcus species (echinococcosis) ©2014 MFMER | slide-14 Anatomy Sparganum removed from the chest wall of a Sparganum removed from the ocular conjunctiva of a patient from patient. The worm measured about 70 mm Taiwan. The worm measured 40 mm long. Image courtesy of Dr. John long. Images from a specimen courtesy of H. Cross and the Uniformed Services University of the Health the Oklahoma State Department of Health. Sciences, Bethesda, MD. ©2014 MFMER | slide-15 Epidemiology and Clinical Presentation • Typically seen in patients from East Asia • May involve multiple organ systems: subcutaneous tissue, breast, orbit, GU tract, lungs, pleural cavity, abdominal viscera and CNS • Symptoms vary by location • S. proliferum can cause proliferative lesions in infected tissue, with multiple larvae present ©2014 MFMER | slide-16 Lu et al. Retrospective epidemiological analysis of sparganosis in mainland China from 1959 to 2012. Epidemiol Infect 2014;142(12): 2654-61. • Retrospective review of 1061 cases: • Patients were <1 year to 80 years old (mean 29 years) • Transmission: • 54.6% - application of frog meat as a poultice • 33.8% - foodborne (frogs and snakes) • 11.5% - waterborne (drinking untreated water) • Organs involved: • Subcutaneous/muscle – 43.1%; • Ocular – 31.0% • CNS – 17.9% ©2014 MFMER | slide-17 Changing epidemiologic patterns in China • 1959 – 1979: most cases (83.8%) were from poultices • 50% involved the eyes • Post 2000, only 8.3% involve the eyes • From 2000 onward, 63.9% of cases are foodborne • 47.8% involve the CNS • (before 1979, there were no cases of CNS involvement reported) ©2014 MFMER | slide-18 Diagnosis • Identification of a sparganum from tissue • Species level identification is not required for treatment ©2014 MFMER | slide-19 Key morphologic features • Features of a cestode: • Myxoid matrix surrounded by an acellular tegument • Calcareous corpuscles ©2014 MFMER | slide-20 Calcareous corpuscles – a histologic features of cestodes: Mineral concretions containing calcium, polysaccharides, and lipids Adult Taenia sp. proglottid Taenia sp. (coenurosis) E. granulosus protoscolex ©2014 MFMER | slide-21 Key Morphologic Features, continued • Features supportive of sparganosis: • No fluid-filled “bladder” surrounding the tapeworm like cysticercosis • No suckers or hooklets of a protoscolex • Longitudinal smooth muscle fibers ©2014 MFMER | slide-22 Comparison of larval cestodes in tissue Sparganosis Cysticercosis Coenurosis Echinococcosis Causative Spirometra Taenia solium Taenia Echinococcus organism spp. multiceps and spp. T. serialis Common Subcutaneous Subcutaneous Skin and Liver, lung locations tissue, breast, tissues, brain, subcutaneous any organ eye tissues 20x – 40x total magnification (2x-4x objective) 400x total magnification Further History and Follow-up • Patient was originally from the Philippines • Moved to the U.S. 10 years prior to presentation • She reported ingestion of frog meat in the Philippines • Removal is curative • Treatment with antihelminths (mebendazole, albendazole, praziquantel) is not generally effective, but may be used for cases of proliferative sparganosis in addition to surgical removal • Patient was counseled on not eating raw frog or snake flesh in the future. ©2014 MFMER | slide-24 Bonus Question • Which other human parasite is transmitted through ingestion of water containing infected copepods? • Dracunculus medinensis CDC Public Health Image Library ©2014 MFMER | slide-25.
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