Pulmonary masses

1-As seen in adults, can be mentioned as the following.

2-Pulmonary neuroblastoma instead of bronchogenic carcinoma.

-The most common malignancy in the 1week of life.

-Mean age at presentation 2 years.

-May regress spontaneously or mature to ganglioneuroma.

-Common sites is adrenal gland, but can arise anywhere along the sympathetic chain including the mediastinum.

-CT appearance:

*Posterior mediastinal para spinal mass.

*Matrix calcification in up to 85% of cases seen by CT.

*Heterogenous density and enhancement.

*Assess for

Intra spinal extension(through foramina).

Contra lateral extension.

Local and distant metastases.

3-Metastatic deposits.

4-Hydatid cyst(Halo sign due to presence of air in the wall).

5-In addition to inflammatory pseudo tumor.

-Most common primary mass in children.

-In second decades.

-Solid sharply defined mass.

-Common in the lower lobes.

-Average size is 5 cm but it may be filled the hemithorax.

-25% have matrix calcification.

-D.D.from neuroblastoma:

*By age and biopsy.