This value set includes codes based on the following rules:

• Include these codes as defined in http://dicom.nema.org/resources/ontology/DCM

  Code	Display	Definition
  112154	Bat's wing distribution	Spatial arrangement of opacities that bears vague resemblance to the shape of a bat in flight; bilaterally symmetric [Fraser and Pare].
  112155	Butterfly distribution	Spatial arrangement of opacities that bears vague resemblance to the shape of a butterfly in flight; bilaterally symmetric [Fraser and Pare].
  112156	Centrilobular	Referring to the region of the bronchioloarteriolar core of a secondary pulmonary lobule [Fraser and Pare].
  112157	Coalescent	The joining together of a number of opacities into a single opacity [Fraser and Pare].
  112158	Lobar	Of or relating to a lobe (a curved or rounded projection or division).

• Include these codes as defined in http://snomed.info/sct

  Code	Display
  255282008	Discoid
  87017008	Focal
  60132005	Generalized
  524008	Multifocal
  65709003	Disseminated
  31099001	Systemic
  19648000	Diffuse
  62372003	Segmental