[Carcinomatous lymphangitis].

DEFINITION: Carcinomatous lymphangitis is a radioclinical entity accounting for about 8% of all cases of lung metastasis defined as the presence of tumoral cells in lymph vessels and lung interstitium.

DIAGNOSIS: Biopsy specimens or bronchial brushings obtained by fibroendoscopy or bronchioalveolar lavage fluid usually reveal adenocarcinoma.

PRACTICAL MANAGEMENT: In clinical practice, the patient presents with dyspnea and non-specific infiltration on the chest x-ray. The clinical situation worsens rapidly. Millimetric CT-scan shows highly suggestive polygonal images in the subpleural area. Respiratory function tests may be helpful for the differential diagnosis, particularly in difficult cases, showing a mixed ventilation disorder without altered carbon monoxide diffusion and hypoxemia at rest without hypercapnia.

SEARCH FOR THE PRIMARY CANCER: Primary lesions must be identified for specific treatment. Pathology findings help guide the search. Despite the highly unfavorable prognosis (median survival = 3 months), etiological treatment when possible can improve quality of life and possibly survival. Symptomatic treatment is indicated and must be adapted to each individual case.