Case report: giant tuberculous cystic lymphangioma of posterior mediastinum, retroperitoneum and groin.

Cystic lymphangioma is a very rare condition of unknown aetiology. It is generally regarded as a developmental malformation in which obstruction or agenesis of lymphatic tissue results in lymphangiectasia secondary to lack of normal communication of the lymphatic system. Most lymphangiomas occur in the neck (75%) and axillary region (20%). Lymphangiomas may rarely occur in the retroperitoneum, mediastinum, mesentery, omentum, colon, pelvis, groin, spleen, bone and skin. We present a case of multicompartmental tuberculous lymphangioma extending continuously from the superior posterior mediastinum through the retroperitoneum to the right groin, which responded to needle aspiration and antituberculosis drug therapy.