Calcaneal Rhinosporidiosis, a Rare Manifestation of Osteomyelitis.

CASE REPORT: A 63-year-old man presented with progressive left heel pain limiting weight bearing over 5 years with a history of probable nasal rhinosporidiosis (45 years ago). Examination showed calcaneal tenderness, and MR imaging revealed a posteroinferior calcaneal lytic lesion suggestive of osteomyelitis. Cultures were negative, but histopathology confirmed Rhinosporidium seeberi. Surgical debridement, local amphotericin B, and prolonged dapsone achieved excellent outcomes without recurrence at 18 months. CONCLUSION: High suspicion and isolation of the organism are crucial for the treatment and successful outcome of Rhinosporidial osteomyelitis.