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Teratomas, usually arising in the anterior mediastinum , are very uncommon in the posterior mediastinum. Embryologic development of anterior mediastinal teratoma is thought to be from thymic anlage which descends from the third branchial cleft and pouch , while that of posterior mediastinal teratoma is thought to be from the remnant of notochord.CT findings of posterior mediastinal teratomas are not different from teratomas elsewhere, containing fat , calcification, soft tissue and thick walled cyst.Ultrasonographic findings are mixed echogenic mass containing cystic portion , highly reflective solid portion and area of acoustic shadowing.Authors recently experienced 2 cases of surgically proven posterior mediastinal teratoma and reoprt with review of literature.

W ith the view point of size, shape and arrangement pattern, authors p resent normal mediastinal Iymp h node fro m t he analysis of 61 cases of (T scan and multidirectional section of 2 cadave rsThe res ul ts we re as fo ll ows:1. Transverse diameter of the Iymph nodes, demonstrated in 'cadaver secti。π was 3 to 6mm in upper paratracheal area and 5 to 14mm in juxta-carinal and AP-window area' Arrangement of the Iymph nodes showed tendencly 。f longitudinal direction in lower paratracheal, and juxtacarinal area, w hile that of AP window showed tendency of AP direction as long axis.2. Mean and the largest size of the Iymph nodes demonstrated in CT scan were 3.7mm, 8mm in upper paratracheal area, and 6mm, 12mm in lower paratracheal area, and 7.1mm, 14mm in juxtacarinal area, and 6.3mm and 11mm in aorti cop 비 monary window area 3. Size of the Iymph nodes in CT scan showed linear increas ing tendency accord ing to increasing age (y=O.32, P