[Restricted mouth opening as a leading symptom of trismus-pseudocamptodactyly syndrome].

In the absence of pain or dental findings, incapacity to open the mouth fully, concomitant with a typical restriction of movement of the fingers is defined as the trismus-pseudocamptodactyly syndrome. This autosomal dominantly inherited feature is quite rare. So far only affections of families in the USA, the Netherlands, Canada and, recently, Japan, have been reported in the literature. Now, a German case affecting six members of the same family has been found for the first time. An important factor to be considered in the differential diagnosis of painless chronic trismus, this syndrome is described here.