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Two cases of longitudinal grooving of nails due to synovial cysts involving the posterior nail fold are reported. Both cases responded satisfactorily to intralesional injection of triamcinolone diacetate. Longitudinal grooves of the nails may be idiopathic as in dystrophia mediana caniliformis of Heller or may be due to any pathological process which alters the nail matrix. One of the more unusual causes of the latter form of this nail dystrophy is the presence of a synovial cyst at the base of the nail. The following cases represent two examples of this condition which responded favorably to intralesional injection of triamcinolone diacetate (Aristocort diacetate).
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Edgar B. Smith (1964) studied this question.
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