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The fourth pattern includes abnormalities that result in decreased lung attenuation or air-filled lesions.
These include:
- Emphysema
-
Emphysema - Lung cysts ... Bronchiectasis - Honeycombing ... #Diagnosis #Radiology ... #Pulmonary #CTChest ... TractionBronchiectasis #Cysts
Radiologists use many terms to describe areas of decreased density or lucencies within the lung, like
emphysema, bulla, honeycombing ... since in many cases ... we describe a chest ... #Lung #Pulmonary ... #Diagnosis #Radiology
Cavities frequently arise within a mass or an area of consolidation as a result of necrosis.
We
the differential diagnosis ... between cavities and cysts ... associated pulmonary ... #Clinical #Diagnosis ... #Radiology #CTChest
High-Res Chest CT Patterns - Differential Diagnosis Framework
Reticular:
 • Septal Thickening: Lymphangitic Carcinoma, Interstitial Edema, Alveolar
- Differential Diagnosis ... Silicosis • Honeycombing ... Hypersensitivity Pneumonitis, Respiratory ... Antitripsyn Def • Cysts ... #pulmonary #radiology
Stridor - Differential Diagnosis Framework:
High-pitched, variable respiratory sound

ETIOLOGIES:
Infectious:
 • Retropharyngeal abscess
 • Acute epiglottitis
 • Peritonsillar
- Differential Diagnosis ... High-pitched, variable respiratory ... • Bronchogenic cyst ... • Recurrent respiratory ... #causes #pulmonary
Differential diagnosis on HRCT
Most of our knowledge about imaging findings in interstitial lung disease comes from
Differential diagnosis ... When the cysts have ... histiocytosis or honeycombing ... #Diagnosis #Radiology ... #Pulmonary #CXR
Honeycombing is defined by the presence of small cystic spaces with irregularly thickened walls composed of
Honeycomb cysts ... regardless of their cause ... Subpleural honeycomb cysts ... #Diagnosis #Radiology ... #Pulmonary #Honeycombing
Water Lily Sign (Camalote Sign) on Chest CT
 • Hydatid cyst in the lung with a
Camalote Sign) on Chest ... CT • Hydatid cyst ... • DDx: Hydatid cyst ... Camalote #CT #Lung #Pulmonary ... #diagnosis #radiology
Mediastinal Mass - Differential Diagnosis Framework

Anterior Mediastinal Mass - 5T’s
 • Thymic neoplasm
 • Teratoma (or
- Differential Diagnosis ... benign growth with respiratory ... of breath • Chest ... #Differential #Diagnosis ... #causes #mediastinum
On the left some diseases with a nodular pattern.
1. Hypersensitivity pneumonitis: ill defined centrilobular nodules.
2. Miliary
before the typical cysts ... Respiratory bronchiolitis ... #Clinical #Diagnosis ... #Radiology #Pulmonary ... #CTChest #Nodular