[Spontaneous pneumothorax in XXXX ].

@entity1 @entity5229 @entity4530 @entity55 @entity1555 @entity358 @entity85
We retrospectively studied an incidence and clinical features of @entity5229 ( @entity5229 ) in @entity1555 ( @entity1555 ) from chest roentgenograms and clinical records of our 50 inpatients, comparing those in severely mentally and physically disabled @entity1 . Nine out of 50 (18%) @entity1555 @entity1 experienced @entity5229 , and their chest roentgenograms showed no evidence of underlying @entity358 , @entity4530 , @entity55 . They were all asymptomatic. Clinical course was well, however, relapse occurred in 4 cases. The onset age was 20 or more in 7 @entity1 (78%), and the incidence of @entity5229 in @entity1 aged 20 or more was 31%, which was 7.4 times higher than that of younger @entity1 . Body weight at the onset of @entity5229 was all below 30 kg, tended to be lower than that of @entity5229 negative cases. Some @entity1 experienced @entity5229 after having lost their weight. @entity5229 occurred much more frequently on the right side (right only, 7 cases; left only, 0; bilateral, 2 cases). @entity85 and artificial ventilation were not major risk factors. We examined chest roentgenograms of 41 severely mentally and physically disabled inpatients, age, sex, and body weight matched and found no @entity5229 . We conclude that @entity5229 is frequent and asymptomatic in @entity1555 and the major risk factors of @entity5229 are age (above 20 years old) and body weight (below 30 kg), while @entity85 , and artificial ventilation are not essential.
