http://dx.doi.org/10.17159/2519-0105/2017/v72no9a4 420 > CLINICAL REVIEW Nasal Rhinosporidiosis in South Africa: Review of Literature and Report of a Case. SADJ October 2017, Vol 72 no 9 p420 - p423 MMJ Masilela1, MS Selepe2, L Masilo.3 Abstract Background Background: Rhinosporidiosis is a rare chronic Rhinosporodiosis is a rare chronic granulomatous infection granulomatous infection presenting primarily on the that presents as sessile or pedunculated polypoid lesion, mucous membrane of nasal cavities, nasopharynx and primarily affecting the mucous membrane of nasal oral cavity. Rhinosporidium seeberi has been identified cavities, nasopharynx and oral cavity.1,2 Whilst extranasal as the causative agent; however recent studies have involvement is rare, skin, eyes and bone, amongst other implicated a waterborne organism, the cyanobacterium sites, may also be affected and it can occasionally present Microcystis aeruginosa, as the cause. It is endemic in as disseminated disease.3-5 The condition is believed India and Sri Lanka where 90% of all infections occur. The to be caused by Rhinosporidium seeberi but recent aim of this paper is to review literature on rhinosporidiosis studies have implicated a waterborne organism, the and to report on one of the sporadic cases encountered cyanobacterium Microcystis aeruginosa.1,6,7 A molecular in South Africa, Gauteng province. study on the polyps of rhinosporidiosis detected 16S rRNA gene in round bodies.6 This confirmed Microcystis Case presentation: A 17 year old black male patient aeruginosa as a causative agent. The presumed mode presented with a pedunculated nasal mass causing of infection is through traumatised epithelium, most nasal obstruction. Microscopical examination showed a commonly in nasal sites. The spread could be auto- polypoid mass with numerous thick walled sporangia in a inoculation, or haematogenous or lymphatic spread.7 It background of fibrovascular connective tissue stroma with may occur anywhere but is endemic in India and Sri Lanka granulomatous inflammation. Fluorescent microscopy where 90% of all infections are recorded.1 was effective in identifying the walls of the sporangia in the granulomas. A final diagnosis of nasal rhinosporidiosis Microscopically, rhinosporidiosis is characterized by hy- was made. perplastic respiratory or squamous epithelium, accom- panied by prominent subepithelial chronic granulomatous Conclusion: Rhinosporidiosis, a rare condition in our inflammation. The connective tissue stroma contains nu- environment, has the potential to disseminate to other merous thick walled, 100 to 300 microns sporangia that parts of the body. It is therefore critical for the clinicians to are in different stages of maturity. Within the sporangia are always consider rhinosporidiosis as a differential diagnosis numerous endospores with a characteristic arrangement when assessing patients presenting with nasal polyps. of immature and mature forms.1 The condition is rare in African continent and to date only 14 cases have been Keywords: Nasal polyp; Rhinosporidium seeberi; reported from South Africa.4,8,9 Sporangia with endospores; Microcystis aeruginosa; Rhinosporidiosis in South Africa. Case Report A 17 year old male patient presented with a pedunculated polypoid mass attached to the anterior part of the nasal 1. Mokgobja MJ Masilela: Department of Oral Pathology, School of Oral Health Science, Sefako Makgatho Health Sciences septum, causing nasal obstruction. The lesion was clinical- University, South Africa. ly suspected to be an allergic polyp. Excisional biopsy was 2. Manoko S Selepe: Department of Otorhinolaryngology, School done and the specimen was submitted for histological ex- of Medicine, Sefako Makgatho Health Sciences University, South Africa. amination. Microscopy revealed a polypoid mass covered 3. Letlhogonolo Masilo: Department of Oral Pathology, School by respiratory epithelium with areas of squamous metapla- of Oral Health Science, Sefako Makgatho Health Sciences sia. The core of the lesion showed numerous thick walled University, South Africa. sporangia in different stages of maturity within the back- Corresponding author ground of a fibrovascular connective tissue stroma with Mokgobja MJ Masilela: dense granulomatous inflammation (Figure 1). Evidence of Department of Oral Pathology, School of Oral Health Science, Sefako fusion of some sporangia between the overlying epithelium Makgatho Health Sciences University, South Africa. Email:[email protected] and ductal lining, with a resultant rupture and release of the endospores onto the overlying surface epithelium and into 422 > CLINICAL REVIEW the ductal lumen respectively, was demonstrated by the capsules of also demonstrated. There were foci the sporangia and endospores of foreign body giant cell reactions revealed distinctly the capsule of a that were probably a reaction to the ruptured sporangium with release endospores released from ruptured of endospores and resultant foreign sporangia. Mucicarmine stained the body giant cell reaction. The inner walls of the capsules of the property of autofluorescence was sporangia and the endospores (Fig- also observed by other authors.14 ure 2). The fluorescent microscope demonstrated autofluorescence of It is important that the incisional the capsules of the sporangia and or excisional biopsy is taken endospores (Figure 3). with caution to avoid spillage Figure 1: Sporangia at different stages of development of endospores from the polyp. Discussion (H&E, 10x). Spillage is usually followed by Rhinosporodiosis is a rare condition autoinoculation through the in the African continent with only a adjacent epithelium and this tends few sporadic cases having been to serve as a base for increased reported in the literature. The recurrences in rhinosporidiosis.15 condition has the highest incidence Hence the recommended treatment in India and Sri Lanka.1 Although is a combination of surgical excision to date only 14 cases have been and electrocoagulation.1 recorded from South Africa4,8,9 others have been reported in Just as the clinical presentation can Burundi, Zaire, Rwanda, Tanzania, mimic certain conditions so may Chad, Malawi, Kenya, Uganda, to the histological features and Congo and Egypt.10-13 Almost the following differential diagnoses all the South African cases were need to be considered: Coccidi- ocular rhinosporidiosis and were Figure 2: Mucicarmine staining the inner wall of the oides immitis, oncocytic Schneide- capsules of the sporangium of the endospores (40x). encountered in patients younger rian papilloma and Myospherulosis. than 15 years of age. This is the first case to be reported in Gauteng Coccidioides immitis also evoke a province and it is also that of a granulomatous foreign body giant younger patient. The case was cell reaction with a dense chronic diagnosed in the Department of Oral inflammatory infiltrate. However; Pathology of Medunsa Oral Health the spherules of Coccidioides im- Centre, Sefako Makgatho Health mitis measure approximately 30 Sciences University. The biopsy – 80μ as compared with those of was submitted by the Department Rhinosporidiosis seeberi which of Otorhinolaryngology, Dr George measure 100 -350μ. The en- Mukhari Academic Hospital. dospores are small and numerous measuring 2-5μ whereas those of It is believed that stagnant ground Rhinosporidiosis seeberi measure Figure 3: Fluorescent microscopy reveals the capsule water is the natural habitat of the of the sporangia. Note the ruptured sporangium with 5-10μ. The capsule of Rhinosporidi- causative agent. Accordingly it release of endospores and resultant foreign body giant cell osis seeberi has a thicker, distinctly will be important to determine reaction (20x). bilaminated capsule that stains with the chemical and physical mucicarmine whereas the capsule characteristics of those waters where it is likely that of Coccidioides immitis does not. Also this type of infec- these South African individuals were infected. Host tion is not common in the nasal cavity.16 predisposing factors such as blood group and genotype HLA types, should also be investigated as there could In oncocytic Schneiderian papilloma, the epithelial lining be many people who are bathing in ponds and lakes; yet has scattered mucous cells with intraepithelial microcysts the incidence of this disease is still low in the country. The that contain mucin and polymorphonuclear cells. The incidence of rhinosporidiosis has been reported to be surface epithelium in rhinosporidiosis lacks oncocytes the highest in individuals of blood Group O followed by and there is no endophytic growth. The microcysts do Group AB.7 Recurrences and dissemination of the disease not have a thick capsule and there are no contained should also be investigated and documented. endospores.17 The clinical presentation of rhinosporidiosis can mimic Myolospherulosis is a rare iatrogenic pseudomycotic le- other non-infectious nasal polyps. It is therefore critical sion characterized by prominent fibrous and chronic in- to take a biopsy for histological examination of the lesion flammation with foreign body-type giant cells surrounding to confirm a definitive diagnosis. The organisms can be pseudocystic spaces. The spaces contain saclike struc- identified easily on sections stained by hematoxylin and tures with a thick dark wall, referred to as parent bodies eosin. Other histochemical stains such as Periodic Acid with enclosed “fungus-like” spherules. These spherules Schiff and mucicarmine can also be used to establish