A strident girl.

A 12-year-old girl was referred with a 7-month history of episodes of dyspnoea, stridor and a sense of chest constriction during physical exercise. These were self-limiting and never occurred at night. Physical examination was normal. An initial diagnosis of vocal cord dysfunction was made.Spirometry showed a plateau of forced expiratory flow, with a truncated aspect of the expiratory phase (figure 1). Six weeks later she described occasional dysphagia with solid foods. The barium swallow, performed only in anteroposterior projection, did not show oesophageal dilation. A bronchoscopy showed extrinsic compression of the middle lower third of the trachea and the right main bronchus. A chest CT scan was performed (figures 2 and 3).

IGF1 for the diagnosis of growth hormone deficiency in children and adolescents: a reappraisal.

A number of studies have evaluated the role of IGF1 measurement in the diagnosis of growth hormone deficiency (GHD). This study aimed to evaluate the accuracy and the best cut-off of IGF1 SDS in the diagnosis of GHD in a large cohort of short children and adolescents. One-hundred and forty-two children and adolescents with GHD ((63 organic/genetic (OGHD), 79 idiopathic (IGHD)) and 658 short non-GHD children (median age 10.4 years) were included in the analysis. The two groups were subdivided according to age (G1 <6, G2 6 <9, G3 9 <12, G4 ≥12) and to pubertal status. Serum IGFI was measured by the same chemiluminescence assay in all samples and expressed as age- and sex-based SDS. Receiver operating characteristic (ROC) analysis was used to evaluate the optimal IGF1 SDS cut-off and the diagnostic accuracy. Median IGF1 SDS was significantly lower in the GHD than in non-GHD patients. The area under the curve (AUC) was 0.69, with the best IGF1 cut-off of -1.5 SDS (sensitivity 67.61%, specificity 62.62%). The AUC was 0.75 for OGHD and 0.63 for IGHD. The accuracy was better in the pubertal (AUC = 0.81) than the prepubertal group (AUC = 0.64). In our cohort, IGF1 measurement has poor accuracy in discriminating GHD from non-GHD. Our findings confirm and reinforce the belief that IGF1 values should not be used alone in the diagnosis of GHD but should be interpreted in combination with other clinical and biochemical parameters.