OVERVIEW

Rhinosporidiosis is a rare, chronic granulomatous infectious disease that primarily affects the mucosal membranes of the nose and nasopharynx. It is caused by Rhinosporidium seeberi, an aquatic eukaryote classified under the group Mesomycetozoea, which sits on the biological boundary between animals and fungi. Over 90% of cases are concentrated in the Indian subcontinent (predominantly Southern India and Sri Lanka), though it can occur sporadically worldwide. The infection typically arises from direct contact with stagnant freshwater sources, leading to the development of highly vascularized, fragile, “strawberry-like” growths. The definitive treatment is total wide surgical excision of the mass. This is frequently performed via a rigid nasal endoscope or laser-assisted approaches.

Symptoms

• Nasal (common): Polypoid masses appear in the nose, and which lead to nasal obstruction, bleeding (epistaxis), and foul-smelling discharge 
• Ocular: Conjunctival polyps cause itching, watering eyes (epiphora), and redness.
• Rare Sites: It mainly affects the throat, skin, or genitalia.

Epidemiology and Risk Factors

• Primary Habitats: Highly endemic to tropical and subtropical areas of India and Sri Lanka. Central India (such as Chhattisgarh) also reports notable clusters.
• Water Exposure: Frequently linked to bathing, swimming, or working in stagnant fresh water, such as ponds, reservoirs, rivers, and paddy fields.
• Occupational Risks: Paddy field workers, agricultural laborers, and river-sand harvesters are at the highest risk.
• Transmission: Non-contagious between humans. It infects individuals via transepithelial inoculation through broken or traumatized skin/mucosa exposed to contaminated water or soil dust. It can also infect livestock like cattle and horses. 

Clinical Features and Affected Sites

 

The infection triggers the slow growth of painless, soft, and polypoid masses. Due to extreme vascularity, these polyps are friable and break or bleed easily upon touch.

• Nasal and Nasopharyngeal (70–75% of cases): Causes nasal obstruction, nasal discharge, local irritation, and recurrent nosebleeds (epistaxis).
• Ocular (15% of cases): Known as oculosporidiosis. It usually surfaces on the conjunctiva or inside the lacrimal sac, manifesting as flat or hanging growths.
• Rare Sites: Can spread to or originate in the lips, palate, pharynx, larynx, trachea, genitalia, and rectum.
• Systemic Dissemination: Extremely rare; can travel through blood to limbs, organs, or the brain, where it becomes life-threatening.

 Diagnosis

Rhinosporidium seeberi cannot be cultured in standard artificial lab media, meaning standard microbiology cultures will not work. 

• Clinical Clue: A characteristic “strawberry” or “raspberry” presentation, where the reddish fleshy mass is studded with tiny white spots (which are mature sporangia visible to the naked eye).
• Histopathology (Gold Standard): A definitive diagnosis relies on biopsy and structural analysis. Microscopic evaluation of excised tissue via Hematoxylin and Eosin (H&E) staining shows thick-walled, spherical structures called sporangia (up to 300 microns) packed with thousands of tiny endospores at various stages of maturity. 

 

Treatment and Management

• Surgical Excision: The definitive treatment is total wide surgical excision of the mass. This is frequently performed via a rigid nasal endoscope or laser-assisted approaches.
• Base Electrocautery: It is mandatory to deeply cauterize (diathermy) the mucosal base where the polyp was attached. This destroys remaining endospores and halts local bleeding.
• Medical Adjuvant: No exclusive medical cure exists. However, oral Dapsone is routinely prescribed post-surgery for several months. It interferes with spore maturation and substantially lowers the likelihood of a relapse.
• Recurrence Warning: Rhinosporidiosis is notorious for its high local recurrence rate if even a few micro-spores spill during extraction. Long-term clinical follow-up is highly advised. 

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