Rhinosporidiosis Rhinosporidiosis R. Seeberi (Life Cycle)
Transcription
Rhinosporidiosis Rhinosporidiosis R. Seeberi (Life Cycle)
8/9/11 Rhinosporidiosis Chronic fungal infection of Then thought to be a Rhinosporidiosis By Courtney Madden, Shalyn Russell & Brittany Seman the mucous membrane that causes an inflammatory polyps in the nasal mucous membranes or external eye membranes Causative agent: Rhinosporidium seeberi water mold Recent molecular techniques (2010) give evidence of being an aquatic protistan parasite Included in a new class Mesomycetozoa Sometimes just referred to as a “water mold” Taxonomy largely debated Originally thought to be a protozoan Rhinosporidium seeberi: Geographic Distribution Most cases restricted to Rhinosporidium seeberi: Epidemiology & Pathogenesis Infections can target: Indian subcontinent Endemic in India, Sri Skin Eyes (~10 % of cases) Nasal cavities (~70% of Other cases are Spread through body Lanka, Africa and South America cases) scattered worldwide included some cases out of the U.S. (Image: http://emedicine.medscape.com/article/227734overview) Males effected 4 times more frequently Occurs mostly in ages 15-40 (rare & life threatening) Nasal Infections- after swimming in stagnant water Occurs in warm climates Eye infections-dust or Water helps release endospores (Images: http://www.merinews.com/article/ indian-subcontinent-after-61-years/ 139296.shtml) air mainly in summer (Image: http://www.stanford.edu/ class/ humbio103/ParaSites2002/ rhinosporidiosis) R. Seeberi (Life Cycle) Starts as juvenile sporangium (1) Grows into immature biamellar sporangia (2,3) Maturation of endospores (4a, 4b) Spores exiting mature sporangium (5) Free endospore w/mucoid material (6) Free electron body (7a)(Diagram: http://www.drtbalu.co.in/rhinosporidiosis.html) http:// dermatology.cdlib.org/ 111/case_presentations/ rhinosporidiosis/5.jpg *infective form* Free electron dense body (7b) BIOL 4849: Medical Mycology August 9, 2011 6 1 8/9/11 BIOL 4849: Medical Mycology August 9, 2011 7 http://www.ijdvl.com/articles/2011/77/4/images/ ijdvl_2011_77_4_517_82391_u1.jpg BIOL 4849: Medical Mycology 8 August 9, 2011 Rhinosporidiosis (cont.) Treatment Surgical removal Electrodessication Dapsone is used sometimes, but does not resolve the disease No known oral/ topical agents that can control the disease http://oto.sagepub.com/content/124/1/121/ F1.small.gif BIOL 4849: Medical Mycology August 9, 2011 Case Report One 32 year on male farmer No significant past medical history Reported non tender swelling over right shoulder Radiograph Imaging and CT Scan Showed a destructive lesion associated with a soft tissue mass Initial biopsy reported rhinosporidiosis Excision of a 17x11.5x9 cm tissue mass and small portion of bone was performed 9 BIOL 4849: Medical Mycology Prevention Use cleaned ponds/water areas for animals/ humans General hygiene, clean showers http://www.arquivosdeorl.org.br/ conteudo/imagesFORL/11-02-19-fig028/9/11 ing.gif 10 Case Report One (cont.) Biopsy of the mass showed solidcystic, yellowish white lesions with areas of necrosis H&E stains showed R. seeberi No recurrance over 12 months http://journals.ohiolink.edu/ejc/pdf.cgi/ Suryawanshi_Pallavi_Vishnu.pdf? issn=03642348&issue=v40i0002&article=225_rit tdcpcmabt 2 8/9/11 Case Report Two After a CT Scan and 53 year old male radiograph were done patient was incorrectly diagnosed with infective arthritis of tuberculous origin Presented with pain in his right ankle and multiple painless warts on his upper lip and forehead amputation from the knee down and excision of the warts right talus was soft and collapsed continuous for one year 10 years prior he had a fungal infection causing swelling in the chin the had been excised Treatment was Surgery showed whole Ankle pain had been Medical history showed Case Report Two (cont.) http://www.josonline.org/pdf/v16i1p99.pdf References Histopathological testing provided diagnosis of rhinosporidiosis http://www.josonline.org/pdf/v16i1p99.pdf References (cont.) Arora, et al . "Epidemiology & Country Information." Standford.edu. N.p., n.d. Web. 5 Aug 2011. <http://www.stanford.edu/class/ humbio103/ParaSites2002/rhinosporidiosis/>. "Rhinosporidiosis." DoctorFungus. N.p., n.d. Web. 5 Aug 2011. <http://www.doctorfungus.org/mycoses/human/other/ thinosporidiosis.php>. Rivard, Robert, and Duane Hospenthal. "rhinosporidiosis." Medscape. N.p., 22 Feb 2010. Web. 5 Aug 2011. <http:// www.emedicine.medscape.com>. Kumari R, Nath AK, Rajalakshmi R, et. al. Disseminated cutaneous rhinosporidiosis: Varied morphological appearances on the skin. Indian Journal of Dermatology, Venereology and Leprology 2009; 1: 68-71. Rhinosporidiosis. Medscape Reference. [Updated 2011 August 3]. Available from: http://emedicine.medscape.com/article/227734-overview Ghosh A, Saha S, Srivastava A, Mishra S. Rhinosporidiosis – unusual presentations. Indian J. Otolaryngol. Head Neck Surg. 2008; 60: 159-162. Survawanshi et al Rhinosporidiosis isolated to the dital clavicle: a rare presentation clinicoradiologically mimicking a bone tumor. Skeletal Radiology. (2011) 40:225–228. Available from: < http://journals.ohiolink.edu/ejc/pdf.cgi/ Suryawanshi_Pallavi_Vishnu.pdf? issn=03642348&issue=v40i0002&article=225_rittdcpcmabt> Amritanand el al Disseminated rhinosporidiosis destroying the talus: a case report. Journal of Orthopedic Surgery. 2008;16(1):99-101. Available from: <http://www.josonline.org/pdf/v16i1p99.pdf> 3
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