Objective The cast specimens of fetal lung and bronchus are made to explore the anatomical structure by using threedimensional reconstruction technology and provide morphological data for clinical practice. Methods One case of 34 weeks fetal lung and bronchus was cast by intubation.The cast specimens were scanned by 128slice spiral CT.Dicom data were obtained and imported into Syngo.via Client workstation to reconstruct the lung and bronchus by maximum density projection (MIP) and to import Mimics 19.0 software for threedimensional reconstruction. Results The cast tube of the bronchial tree is full

thick and detailed

which can clearly show the shape

diameter and distribution of the branches of the fetal lung and bronchus;the MIP reconstructed image can clearly show the branches of grade 3 to 5 with fewer artifacts;the shape of the fetal lung and bronchus reconstructed on mimics is realistic

and the sparsity of the ends of each branch can be adjusted by its threshold size

which can be observed from multiple multilevel

multifaceted

multiangle

with stong sense of threedimensional space. Conclusion The fetal lung and bronchus distribution can be understand by vascular casting technology

MIP reconstruction technology and mimic reconstruction technology

which provide the morphological data of fetal lung and bronchus for clinical medicine teaching

virtual surgery and intrauterine interventional surgery.