Breast Mass on Mammography

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1 Breast Mass on Mammography Bobbi Pritt, MD 2014 MFMER slide-1

2 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

3 2014 MFMER slide-3

4 H&E 20x

5 H&E 40x

6 H&E 100x

7 H&E 200x

8 H&E 400x

9

10 Diagnosis? 2014 MFMER slide-10

11 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

12 Pseudophyllidea Cyclophyllidea Diphyllobothrium latum(and other Diphyllobothrium spp.) Spirometra species Taenia solium Taenia saginata Dipylidium caninum Hymenolepis nana Hymenolepis diminuta Echinococcus species 2014 MFMER slide-12

13 Humans are an incidental parentenic or second intermediate host 2014 MFMER slide-13

14 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

15 Anatomy Sparganum removed from the chest wall of a patient. The worm measured about 70 mm long. Images from a specimen courtesy of the Oklahoma State Department of Health. Sparganum removed from the ocular conjunctiva of a patient from Taiwan. The worm measured 40 mm long. Image courtesy of Dr. John H. Cross and the Uniformed Services University of the Health Sciences, Bethesda, MD MFMER slide-15

16 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

17 Lu et al. Retrospective epidemiological analysis of sparganosis in mainland China from 1959 to Epidemiol Infect 2014;142(12): 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

18 Changing epidemiologic patterns in China : 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

19 Diagnosis Identification of a sparganum from tissue Species level identification is not required for treatment 2014 MFMER slide-19

20 Key morphologic features Features of a cestode: Myxoid matrix surrounded by an acellular tegument Calcareous corpuscles 2014 MFMER slide-20

21 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

22 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

23 Comparison of larval cestodes in tissue Sparganosis Cysticercosis Coenurosis Echinococcosis Causative organism Spirometra spp. Taenia solium Taenia multiceps and T. serialis Echinococcus spp. Common locations Subcutaneous tissue, breast, any organ Subcutaneous tissues, brain, eye Skin and subcutaneous tissues Liver, lung 20x 40x total magnification (2x-4x objective) 400x total magnification

24 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 MFMER slide-24

25 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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