Image Gallery: Congenital onychodysplasia of the toenails

Congenital onychodysplasia of the ring finger presenting as a bifid nail

“…3 Abnormalities in the bone have ranged from distal phalanx abnormalities of the affected finger, most commonly enlargement with bifurcation (often described as Y-shaped or clawlike); deformities of the hand, such as syndactyly or brachymesophalangy; and functional deformities, such as restricted flexion in the distal interphalangeal joint of the affected finger. 1,2,4 Bony abnormalities can also be present in a finger that shows no visible nail dysplasia, as noted in the left fifth digit of our patient. 1 In our patient, each wing of the bony bifurcation was likely associated with its own nail matrix, leading to the clinical presentation of a ventrally oriented S-shaped bifid nail.…”

“…1 Since first being defined by Iso in 1969 and Kikuchi in 1974, cases of congenital onychodysplasia of the third finger and second toe have been reported. 1,2 However, to the best of our knowledge, no previously reported cases of congenital onychodysplasia of the ring finger were found. Associated congenital nail abnormalities include micronychia, polyonychia, anonychia, hemionychogryphosis, malalignment, and irregularities of the lunula.…”

“…Congenital onychodysplasia, or Iso‐Kikuchi syndrome, has classically been characterized as a congenital nail abnormality of one or both index fingers, often with an associated bone anomaly and without family history 1 . Since first being defined by Iso in 1969 and Kikuchi in 1974, cases of congenital onychodysplasia of the third finger and second toe have been reported 1,2 . However, to the best of our knowledge, no previously reported cases of congenital onychodysplasia of the ring finger were found.…”

“…Associated congenital nail abnormalities include micronychia, polyonychia, anonychia, hemionychogryphosis, malalignment, and irregularities of the lunula 3 . Abnormalities in the bone have ranged from distal phalanx abnormalities of the affected finger, most commonly enlargement with bifurcation (often described as Y‐shaped or clawlike); deformities of the hand, such as syndactyly or brachymesophalangy; and functional deformities, such as restricted flexion in the distal interphalangeal joint of the affected finger 1,2,4 . Bony abnormalities can also be present in a finger that shows no visible nail dysplasia, as noted in the left fifth digit of our patient 1 .…”