Epidemiology

• Uncommon etiology of pulmonary nodule (without endobronchial presentation)

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Physiology

• Benign lung neoplasm

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Diagnosis

• CXR Pattern: almost always present endobronchially, but may occasionally present as a solitary lung nodule
  • Appearance: well-define and homogenous
  • Location: no lobar predilection
  • Calcification: rare
  • Cavitation: none
• Chest CT: useful to define fatty density
  • Low Density by Hounsfield Units Measurement: -50 to -300 HU is consistent with fat
  • Pure air or emphysema: -1000 HU
  • Normal lung parenchyma: -750 HU
  • Normal soft tissue and parenchymal lesions: around 10-70 HU
  • Calcified lesions: >100-400 HU
  • Bone: 1000 HU
• FOB: almost always endobronchial in location

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Clinical

• Obstructive Symptoms (see [[Obstructive Lung Disease]]): atelectasis/post-obstructive pneumonia

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Treatment

• xxx

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References

• xxx