[Mediastino-pulmonary sarcoidosis in children. Clinical study, analysis of data of bronchoalveolar fluid lavage and respiratory function tests, therapeutic trends].

A series of 27 children (mean age: 12 yrs, 5 mos.) presenting with thoracic sarcoidosis is reported. This series, collected from 1961 to 1988 shows the rarity of the disease at that age. However the low rate of asymptomatic forms (22%) suggests that the frequency of the disease is underestimated, as it is not diagnosed. The histological proof is necessary for the diagnosis. When peripheral lesions available for biopsy are lacking, a liver needle biopsy is helpful (93% of positivity). This study shows the frequency of multivisceral types, the intensity of the macrophagic and lymphocytic alveolitis. The therapeutic indications depend on the comparison of the radiological stage, the results of pulmonary function tests (PFT), those of the bronchoalveolar lavages (BAL) and of the serum granulomatous activity markers, especially concerning angiotensin converting enzyme (ACE). When present at the beginning of evolution, several risk factors lead to use a corticosteroid treatment: age of onset before 4 years, multivisceral involvement, presence of functional pulmonary signs, delayed diagnosis and onset of treatment, impaired respiratory function (especially concerning the alveolo-capillary diffusion), PMN cells greater than or equal to 2% in the initial BAL, and IgG proteins greater than 4 SD. Thus sarcoidosis in children differs from that seen in adults as it has a more marked evolutive tendency and leaves severe sequelae in one third of patients.