3.3 Pathological examination
All the patients were treated with surgery. The resected affected site
was the right lower lobe in 50% (3/6), patients the right upper lobe in
16.7% (1/6) patient. However, there are 33.3% (2/6) patients (No.3 and
No.5) affected both lung lobes, the resection of right lower lobe was
made in patient No.3, and the resection of left lobe was made in patient
No.5.
The gross specimens showed multiloculated cysts with variable size
within the pulmonary parenchymal, and the cysts had a smooth inner
surface. Some cysts contained a small amount of clear fluid.
Histological examination showed that the walls of the cysts were
adjacent to interlobular septa or bronchovascular bundles, the wall of
cysts was composed of a thin layer of fibrous tissue, and the thin band
of fibrous tissue was discontinuous. Small collections of uninucleated
and multinucleated macrophages were lined in the surface of the main
cysts (Fig. 2 and Fig. 3) . The giant cells contained from 2 to
40 centrally placed nuclears.
The adjacent parenchymal surrounded the cysts showed mild to marked
atelectasis and inflammatory cells infiltrates in all cases(Fig. 2 and Fig. 3) , containing histocytes, lymphocytes, plasma
cells, and neutrophils, indicating there were inflammation along the
cysts.