Less Common Pulmonary Diseases Flashcards
Diameter of wall for classification of a cyst
<2 mm
5 major types of diffuse cystic lung disease
LAM, PLCH, BHD, LIP, amyloidosis
CT findings in LAM
diffuse cystic disease with normal intervening parenchyma
Diagnostic criteria for LAM
Characteristic CT findings and 1 of the following (biopsy showing LAM, renal angiomyolipomas, chylothorax, tuberous sclerosis complex, high serum VEGF-D level > 800)
Management of LAM
Sirolimus (rapamycin), supportive, lung transplant
Cell proliferation causing LAM
HMB-45+ (LAM cells)
Two inheritance patterns of LAM
Sporadic and TSC related gene mutations
Characteristic individual with PLCH
young adult smokers
Cells found in lesions with PLCH
CD1a+, langerin+ CD207
Mutation associated with PLCH
BRAF-V600E
2 extrapulmonary diseases associated with PLCH
Bone lesions and Diabetes Insipidus
HRCT findings in PLCH
Irregular cysts with basilar sparing, nodules +/- cavidation, reticular opacities
Diagnostic criteria for PLCH
Characteristic CT findings with BAL >5% CD1A cells or biopsy
Management of PLCH
Stop smoking, 2-chlorodeoxyadenosine (2-CdA, cladribine), BRAF inhibitors (vemurafenib) if BRAF mutation, Steroids, Transplant
Inheritance of BHD
autosomal dominant, phenotype variable
Genes and chromosome associated with BHD
BHD (FLCN) gene on chromosome 17p11.2, tumor-suppressor protein gene, folliculin gene
2 extrapulmonary findings in BHD
Fibrofolliculomas and renal tumors
Diagnostic criteria for BHD
Cystic disease with any of the following (family hx of BHD, characteristic skin lesions, renal tumors, or gene testing)
Treatment of BHD
Management of pneumothorax, life-long surveillance for kidney tumors, no specific therapy
Disease characterized by monoclonal plasma cell proliferation localized to the lung
Pulmonary Light Chain Deposition Disease (LCDD)
Substance secreted by macrophages in PLCDD that causes elastolysis and cyst formation
metalloproteinases
Diagnostic criteria for PLCDD
Biopsy showing non-amyloid deposits in the alveoli and small airways (no beta pleated sheets and negative congo red staining)
Treatment for PLCDD
Chemotherapy and HSCT
HRCT findings in PLCDD
cysts with nodules
Histopathologic findings in Follicular bronchiolitis
Hyperplastic lymphoid follicles with reactive germinal centers along bronchovascular bundles
HRCT findings in follicular bronchiolitis
Small nodules with patchy ground-glass opacities and occasional cysts
Diseases associated with follicular bronchiolitis
CTDs, immunodeficiency, infections, hypersensitivity reactions
2 rare inheritable causes of lung cysts
Neurofibromatosis type 1 (NF1) and Marfan syndrome
Disease characterized by accumulation of lipoproteinaceaous material in the alveoli
Pulmonary alveolar proteinosis (PAP)
Most common cause of PAP
autoimmune (90%) disruption of GM-CSF signaling leading to impaired surfactant metabolism by macrophages
Labs and antibodies elevated in PAP
Serum LDH, surfactant A and D, KL-6, anti-GM-CSF in serum and BAL
HRCT findings in PAP
GGO and/or consolidative opacities, patchy or diffuse with sharp demarcation from normal lung (Crazy Paving)
Treatment of PAP
Whole lung lavage (supportive care only if mild), GM-CSF replacement, rituximab, statin
Disease characterized by extensive intraalveolar deposition of concentrically lamellated calcium phosphate spheres
Pulmonary alveolar microlithiasis
Inheritance pattern and gene associated with pulmonary alveolar microlithiasis
Autosomal recessive, SLC34A2 gene
Mechanism behind pulmonary alveolar microlithiasis
SLC34A2 gene mutation leads to lack of type IIb sodium phosphate cotransporter in the lungs, leads to abnormal phosphorus metabolism by type II cells causing calcium phosphate microliths
Treatment for pulmonary alveolar microlithiasis
none, lung transplant
HRCT findings in pulmonary alveolar microlithiasis
“Sandstorm” appearence of parenchyma with black pleural line
Rare disease characterized by foamy CD1a negative histiocytes, fibrosis, and osteosclerotic lesions of long bones
Erdheim-Chester Disease
Management of Erdheim-Chester Disease
BRAF inhibitors (vemurafenib), interferon-alpha, chemo
Rare disorder characterized by diffuse lymphatic proliferation in the lungs
Diffuse pulmonary lymphangiomatosis
HRCT findings in diffuse pulmonary lymphangiomatosis
Diffuse interlobular septal thickening, patchy GGO, mediastinal infiltration, and pleural thickening/effusion
Treatment of Diffuse pulmonary lymphangiomatosis
sirolimus, bevacizumab
Most common form of amyloidosis
AL
Two different patterns of parenchymal amyloidosis
Nodules (amyloidomas) or diffuse infiltrates with septal thickening
Diagnosis of pulmonary amyloidosis
biopsy material showing apple-green birefringence with polarized light on congo red staining
Treatment of trachobronchial amyloidosis
Bronchoscopic laser, external beam therapy
Treatment of diffuse parenchymal amyloidosis
treat underlying plasma cell dyscrasia
Disease characterized by lymphoplasmacytic infiltrate of IgG4 plasma cells and fibrosis
IgG4 related disease
Diagnosis requirements of IgG4RD
2 out of 3 (dense lymphoplasmacytic infiltrate, storiform fibrosis, obliterative phlebitis), or High IgG4 level with clinical symptoms
Treatment of IgG4RD
30-60 mg/day of prednisone then taper over weeks to months, rituximab
Timing post radiation for radiation pneumonitis
4-12 weeks
Timing post radiation for radiation fibrosis
6-12 months
Treatment of radiation pneumonitis
40-60 mg/day prednisone x 2 weeks, then taper over 4-12 weeks
Disease characterized by congenital pulmonary manifestation with anomalous systemic arterial supply from the aorta
Bronchopulmonary sequestration
Raoof article differential for true cysts that are subpleural
Bullae, paraseptal emphysema, honeycombing
Raoof article differential for true cysts that are intraparenchymal and associated with GGO
PCP pneumonia, DIP
Raoof article differential for true cysts that are intraparenchymal with nodules on CT
LIP, PLCH, Light chain deposition disease, AMyloidosis
Raoof article differential for true cysts that are intraparenchymal, no other CT findings, and are solitary or incidental
Incidental cyst, pneumatocele, bronchogenic cyst
Raoof article differential for true cysts that are intraparenchymal, no other CT findings, and diffuse/multiple found
BHD, LIP, Malignancy, Infection, LAM, PLCH, tracheobronchial papillomatosis
Cystic lung disease associated with
- Lower lobe predominant
- Elongated
- Subpleural and paramediastinal
- Associated with a 24% pneumothorax risk
Birt Hogg Dube
Fibrofolliculomas in birt hogg dube
Cystic lung disease associated with
- Round cysts
- Diffuse involvement including juxtaphrenic recesses
- Intervening normal lung
- Chylous effusions
- Effects women of childbearing age
- Renal angiomyolipomas
LAM
Cystic lung disease associated with
- Cysts with nodular walls
- Pathcy opacities and nodules
- Areas of fibrosis
- Multiple resections of papillomas and tracheostomies
Trachobronchial papillomatosis
Cystic lung disease associated with
- Few cysts or centrolobular nodules
- Bilateral reticular opacities, lower lobe predominant
- Septal thickening
- Middle aged women
- Hx of CVD, HIV, or CVID
LIP
Cystic lung disease associated with
- Nodules predominantly
- Mediastinal adenopathy
- Plasma cell dyscrasias
- Ig deposition in kidneys, heart, and liver
Light chain deposition disease
Cystic lung disease associated with
- Nodules primarily
- Sjogren’s syndrome
- GGO
- Nodules are lower lobe predominant
Amyloidosis
Cystic lung disease associated with
- Upper and middle lobe nodules
- Variable size nodules that are bizarre shapes
- Spares costophrenic angles
PLCH