Lymphangiomas or cystic hygromas are malformations of the lymphatic ve
ssels and are characterized by single or multiple cysts which have dev
eloped within the soft tissues. They occur most commonly in the neck (
75 per cent of cases) and are often associated with hydrops or chromos
omal abnormalities (Romero et al., 1988). Mediastinal or abdominal loc
ations are rare and represent less than 5 per cent of cases in the lit
erature (Singh et al., 1971). This paper represents the first reported
case of prenatal diagnosis of a lymphangioma in the neck, mediastinum
, and abdomen. Diagnosis was made before fetal viability, and allowed
us to recommend termination of the pregnancy because of the poor progn
osis.