Interstitial

lung pattern

Nodular/structured interstitial

Neoplasia
Haematoma
Abscess
Granuloma (+lymphadenomegaly)
Haematocele
Cyst

Reticulo-nodular/miliary

Metastases
Granulomatous pneumonia
Mycotic pneumonia
(Blasto-, Coccidio-, Cryptococcosis; Histoplasmosis)
+/- lymphadenomegaly

Unstructured interstitial

Artefact
(technique or patient related)
Age
Fibrosis
Diseases in transition

  • Pneumonia
  • Oedema
  • Haemorrhage

Neoplasia
(esp. Lymphoma)
Pneumonitis

  • Viral
    (e.g. distemper)
  • Bacterial
    (e.g. leptospirosis)
  • Rickettsiosis
  • Parasitic
    (e.g. Aerulostrongylus,
    Dirofilariosis, Babesiosis,
    Toxoplasmosis, Neosporosis)
  • Toxic
    (e.g. Paraquat, often associated with pneumomediastinum)
  • Inhalation
    (e.g. smoke, dust)
  • Metabolic
    (e.g. septicaemia,
    uraemia, Cushing’s disease)
  • ARDS
  • Eosinophilic bronchopneumopathy
  • Thromboembolic disease
  • Radiation induced