Subungual Exostosis of a Finger Resembling Pterygium inversum unguis

Tender subungual lesion of the first toenail in an 11‐year‐old girl

“…3 Although a subungual tender flesh-colored nodule with onycholysis is the most typical presentation of subungual exostosis, the clinical presentation can vary depending on the size and location of the bony overgrowth. 4 As seen in this case, subungual exostosis should be considered in the differential of ventral pterygium (pterygium inversum unguis). These lesions may also mimic verruca, pyogenic granuloma, fibroma, glomus tumor, myositis ossificans, and amelanotic melanoma.…”

HYPONYCHIUM ABNORMALITIES Congenital Aberrant Hyponychium vs. Acquired Pterygium Inversum Unguis vs. Acquired Reversible Extended Hyponychium: a proposed classification based on origin, pathology and outcome

“…, but any disease compromising the vascular or nervous system in the area can result in traumatic episodes that compromise the fingertip tissue leading to this type of scarring. The described changes have also been observed in patients with leprosy, stroke and subungueal exostosis . This may or may not be painful, depending on the underlying cause.…”

“…The described changes have also been observed in patients with leprosy, stroke and subungueal exostosis. [6][7][8] This may or may not be painful, depending on the underlying cause.…”

Subungual Exostosis of the Finger with Nail Plate Induction

“…Although the latter may be a secondary consequence, as SE can elevate the nail causing exposure of the underlying soft tissue. However, others have alluded to genetic etiology [6], supranumery digits, cartilaginous rests, or a forme fruste of hereditary multiple exostoses [10]. SE is seen predominantly in females in a ratio of up to 2:1 [2,5], though one series documented occurrence more often in males [8].…”