A patient already published a case of Richner-Hanhart syndrome (RHS) (stabilized corneal lesions and hyperkeratotic lesions on the palms and soles) proved to be associated with tyrosinemia type II. 2 other cases (sister and brother) with only typical dermatologic features of RHS and tyrosinemia type II are described. The treatment with a low phenylalanine and tyrosine diet improves the cutaneous lesions in our 3 cases.
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N. Hunziker (2009) studied this question.