Fetal Hydantoin Syndrome

Hyperconvex Nails

Figure 1.99. This infant's triangular nails fit into the category of tapered nails that become progressively narrower and more hyperconvex as they grow distally. The nails generally reflect the size and shape of the underlying distal phalanx (e.g., hypoplastic nail, narrow hyperconvex nail, short broad nail).

Figure 1.100. In this infant with the fetal hydantoin syndrome the nails are hypoplastic and distorted or absent over the short hypoplas-tic distal phalanges. Note the digi-talization of the thumbs. Total nail aplasia is very rare. At birth, some or all of the fingers bear a rudimentary nail bed. In nail-patella syndrome, partial nail aplasia occurs, particularly in the thumbs and index fingers.

Figure 1.101. Unusually broad nails of normal length are found over digits with duplication of the distal phalanx. They are also seen in Rubenstein-Taybi syndrome and Larsen's syndrome.

Figure 1.102. Unusually broad toes in another infant with Rubenstein-Taybi syndrome.

Figure 1.100. In this infant with the fetal hydantoin syndrome the nails are hypoplastic and distorted or absent over the short hypoplas-tic distal phalanges. Note the digi-talization of the thumbs. Total nail aplasia is very rare. At birth, some or all of the fingers bear a rudimentary nail bed. In nail-patella syndrome, partial nail aplasia occurs, particularly in the thumbs and index fingers.

Fetal Hydantoin Syndrome

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