Subungual Exostosis (Subscribe)  

Subungual exostosis is the correct answer. These lesions are benign, bony outgrowths that frequently masquerade, and are sometimes mistaken, for malignancy. An exostosis has been defined as a bony outgrowth from the surface of a bone.1 Exostoses growth is almost always on the margin, and usually on the inner margin,...

This subungual lesion usually presents as a painful mass localized dorsomedially, often associated with elevation and ultimately ulceration of the nail plate and bed (Kilpatrick et al., 1997). It may occur at any age, but most often in patients between 15 and 25 years of age, without sex predominance. Pain...

The nail complex is the structural and functional unit of the nail. The nail consists of the plate; bed; matrix; proximal, lateral, and distal grooves; proximal and lateral folds; and hyponychium. Aside from being aesthetically appealing, the healthy nail unit has the important function of protecting the distal phalanges, fingertips,...

Subungual exostosis is an acquired, benign bony tumor that can affect any age group but most often is discovered in persons 10 to 30 years of age. It presents as a distal, subungual mass, usually on the dorsal-medial great toe.
JEFFREY J. MEFFERT, COL, USAF, MC American Family Physician 1st Jan 2000

Osteochondroma of the Big Toe

Atlas of Genetics and Cytogenetics in Oncology and Haematology
Subungual exostosis usually presents as a slowly growing, painful mass localized dorsomedially in the distal phalanx, and in contrast to osteochondroma, there is usually no continuity with the underlying cortex.

Short account with several illustrations

Subungual exostoses are osteochondromas. They occur mainly under the medial nail folds of the great toes, although they can appear on the lesser toes. They present with a complaint of pain in the toe, sometimes localised to the nail fold. Sometimes the swelling itself may cause pressure on the shoe. Some...

NEJM Images in Clinical Medicine
Subungual exostosis is a benign osteocartilaginous tumor. It occurs predominantly in children and young adults and often affects the great toe. It has been thought to reflect a reactive metaplasia resulting from microtrauma, but its exact pathogenesis is unclear.
Alexandre Campanelli, M.D. Luca Borradori, M.D. Volume 359:e31 December...

The cause for Subungual Exostosis remains unknown, although relationships with trauma, infection and irritation have all been suggested. We report the case of a 23 year old female who developed this condition after Zadek’s procedure done for an in growing toe nail. Abstract
Vinayagam LeninBabu; Charlotte Brown; Tahmeena Dean; and Ashok...

Subungual Osteochondroma or Exostosis Cartilaginea of the Hallux: A Case Report of Recurrent Bone Tumor One Year After Removal
by Al Kline, DPMP1TP Podiatry Internet Journal 2 (2):4
Osteochondroma is the most common benign bone tumor of the foot. A case is presented of a teenage girl who returns after one year excision...