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Subungual osteochondroma of the big toe: an uncommon presentation
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- Published: June 25, 2026
Subungual osteochondroma of the big toe: an uncommon presentation
Salma Kozmane 1 
, Zakia Douhi 2 , Hafsa Laouni 2, Layla Tahiri-Elousrouti 3, Fatimazahra Mernissi 2
1 Department of Dermatology, Hassan II University Hospital, Faculty of Medicine, Pharmacy and Dental Medicine, Sidi Mohamed ben Abdellah University of Fez, Morocco; 2 Department of Dermatology, Hassan II University Hospital, Faculty of Medicine, Pharmacy and Dental Medicine, Sidi Mohamed ben Abdellah University of Fez, Fez, Morocco; 3 Department of Pathological Anatomy and Cytology. Hassan II University Hospital, Faculty of Medicine, Pharmacy and Dental Medicine, Sidi Mohamed ben Abdellah University of Fez, Fez, Morocco
Salma Kozmane, Zakia Douhi, Hafsa Laouni, Layla Tahiri-Elousrouti, Fatimazahra Mernissi
La información completa de afiliaciones y autor de correspondencia está disponible en la versión original en PDF.
*Correspondence: Fatimazahra Mernissi, Email not available
Abstract
Subungual osteochondroma is a rare benign bony tumor that typically affects the phalanges of the fingers or toes, most frequently the distal phalanx of the big toe. We report a new observation of a 15-year-old female who presented with a slowly growing mass beneath the nail of her right great toe, causing anonychia and pain. Clinical and dermoscopic examination revealed an erythematous ulcerating tumor. Given these non-specific signs, pyogenic granuloma, osteochondroma, squamous cell carcinoma, and amelanotic melanoma were considered. Excisional biopsy confirmed osteochondroma, which was surgically removed, and a hydrocolloid dressing was applied. At 6-month follow-up, she showed lateral onycholysis and hyperkeratosis treated with urea cream, with no signs of recurrence.
Keywords: Dermoscopy. Nail tumor. Osteochondroma. Surgery.
