A case report of osteogenic sarcoma with leprosy.

This is a rare case report of osteosarcoma with lepromatous leprosy. A 15 year old male patient presented with swelling around the right knee joint. Imaging and biopsy were consistent with osteosarcoma. After his first cycle of adjuvant chemotherapy (ACT), the patient developed fever, erythematous nodules, perichondritis of ear lobe, and thickened nerves. His slit-skin smear examination showed acid-fast bacilli in clumps, and a diagnosis of multibacillary leprosy was made. He was treated with anti-leprosy medications with steroids, and once his condition stabilized, his ACT was continued. On follow-up, his skin lesions completely recovered.