Solitary pulmonary nodules

Solitary pulmonary nodule (SPN) is defined as a relatively well defined round or oval pulmonary parenchymal lesion equal to or smaller than 30 mm in diameter. It is surrounded by pulmonary parenchyma and/or visceral pleura and is not associated with lymphadenopathy, atelectasis, or pneumonia 9.

Questions to ask when you want to approach a solitary pulmonary nodule :

  • is the lesion solitary?
  • is it intrapulmonary?
  • is the lesion a nodule?
    • should be a discrete round/oval opacity 4-30 mm in diameter; a lesion >30 mm is defined as a mass, not a nodule
    • should not be linear or angular

There are many causes of solitary pulmonary nodules, including:

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Article information

rID: 4993
System: Chest
Section: Approach, Gamuts
Synonyms or Alternate Spellings:
  • Solitary pulmonary nodules (SPNs)
  • Solitary pulmonary nodule (SPN)
  • Solitary pulmonary nodule
  • Solitary pulmonary nodule - causes
  • Differential of a solitary pulmonary nodule
  • Differential of a single pulmonary nodule

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Cases and figures

  • Case 1: fat containing
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  • Case 2: pulmonary hamartoma
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  • Case 3: solitary metastasis
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  • Case 4: pulmonary inflammatory pseudotumor
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