Case Based Fetal Lung Masses
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1 Case Based Fetal Lung Masses Advances in Fetal and Neonatal Imaging Course Orlando, Florida, January 28, 2017 Leann E. Linam, MD Associate Professor Radiology University of Arkansas for Medical Sciences/ Arkansas Children s Hospital
2 Prenatal Imaging of fetal lung masses US primary imaging modality Lungs homogeneous; hyperechoic to liver and increasing echogenicity with gestational age Focal increase in echogenicity, mediastinal shift, cysts can indicate mass MRI can help further delineate lung mass Added clinical value debated Levine, et al 2003, MRI changed management in only 8% of cases with fetal thoracic abnormalities; additional information in 38%
3 Fetal Chest: KEY POINTS CLASSIFICATION IS DIFFICULT BRONCHIAL ATRESIA IS LIKELY UNDERLYING CAUSE OF MOST LESIONS BIG IS BAD HYDROPS IS VERY VERY BAD
4 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
5 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
6 Bronchial Atresia Proximal bronchial atresia with mucoid impacted central bronchi and normal distal lung architecture. Most common: apicoposterior segment of left upper lobe > RUL > RML. Likely occurs between gestational weeks 5 and 15, may be due to loss of arterial supply. Associations: CLE, BPS, CPAM ( bronchial obstruction sequence )
7 Bronchial Atresia
8 Bronchial Atresia
9 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
10 Congenital Lobar Overinflation Progressive over distention from obstruction in at least one segment or lobe. Obstruction can be intrinsic or external Congenital heart disease 15-40%.
11 Congenital Lobar Overinflation
12 Congenital Lobar Overinflation
13 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
14 Foregut Duplication Cyst Bronchogenic cyst, enteric cyst, neuroenteric cyst. Abnormal ventral budding of the tracheobronchial tree. Well defined mass, usually middle mediastinum Homogeneous, brighter than CSF in T2 and STIR.
15 Foregut Duplication Cyst
16 Foregut Duplication Cyst
17 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
18 Congenital Pulmonary Airway Malformation Stocker Classification: Original, 1977, 3 types Current 4 types Controversial, not comprehensive Langston Classification: more descriptive, based on pathogenesis
19 Congenital Pulmonary Airway Malformation
20 Congenital Pulmonary Airway Malformation Type 0 Acinar dysplasia Exceedingly rare Usually bilateral Incompatible with life
21 Congenital Pulmonary Airway Malformation Type 1 Large cyst type 65% Associated with airway obstruction in utero Hamartoma vs. neoplasm
22
23 Congenital Pulmonary Airway Malformation Type 2 medium cysts Bronchial atresia with obstruction 10-15% Seen in ELS and ILS
24
25 Congenital Pulmonary Airway Malformation Type 3 very small cysts Pulmonary hyperplasia, solid/adenomatoid type 5-8% Hamartoma vs. hyperplasia
26
27 Congenital Pulmonary Airway Malformation Type 4 Peripheral cyst type Pleuropulmonary blastoma: type 1 PPB? Regressed type 1 adenomatoid malformation 10-15% neoplasm
28 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
29 Bronchopulmonary Sequestration Bronchial atresia with systemic vascular connection Nonfunctioning pulmonary tissue with no connection to the tracheobronchial tree or pulmonary arteries. Well defined wedge shaped mass. Most common in posterior segment of left lower lobe. LLL > RLL. 90% above and 10% below the diaphragm. Homogeneous and solid if above diaphragm. Often cystic if below the diaphragm- can be mistaken for an adrenal mass.
30 Bronchopulmonary Sequestration
31
32
33 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
34 BPS/CPAM hybrid lesions Systemic vascular supply with cystic components bronchial atresia malformation sequence
35 BPS/CPAM hybrid lesions
36 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
37 Pleuropulmonary Blastoma Malignant embryonal tumor 3 types: cystic, mixed cystic and solid, solid Type 1 occurs only in infants Current thinking is that Stocker Type 4 CPAM and PPB can be easily mistaken Possible regressed or undersampled
38 Pleuropulmonary Blastoma
39 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
40 Mediastinal Teratoma Most common mediastinal germ cell tumor. Arise from primitive germ cell rests.
41 Mediastinal Teratoma
42 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
43 Congenital High Airway Obstruction Syndrome Pulmonary hyperplasia resulting from laryngeal atresia Hyperechogenic lungs
44 Congenital High Airway Obstruction Syndrome
45 CHAOS: day 1 day 2 3 months
46 Fetal Lung Masses Bronchopulmonary malformations: Bronchial Atresia Congenital Lobar Overinflation Foregut Duplication Cyst Congenital Pulmonary Airway Malformation Bronchopulmonary Sequestration Hybrid Lesions Other Masses: Pleuropulmonary Blastoma Mediastinal Teratoma Congenital High Airway Obstruction
47 Fetal Chest: KEY POINTS CLASSIFICATION IS DIFFICULT BRONCHIAL ATRESIA IS LIKELY UNDERLYING CAUSE OF MOST LESIONS BIG IS BAD HYDROPS IS VERY VERY BAD
48 References: Pacharn P, et al. Congenital lung lesions: prenatal MRI and postnatal findings. Pediatr Radiol (2013) 43: Zucker EJ, et al. Perinatal ThoracicMassLesions:Pre-and Postnatal Imaging. Semin Ultrasound CT MRI 36: Fowler DJ, SJ Gould. The Pathology of congenital Lung Lesions. Semin Ped Surg 24 (2015)
49 Thank You!!
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