LESION SIZE (RADIOLOGICAL) is the radiological estimate size of the maximum diameter of the primary Lesion (or largest Lesion if there is more than one), measured in 'Millimetres (mm)'.

For the Cancer Outcomes and Services Data Set: Central Nervous System:

• The maximum size of the Tumour or Lesion will be 99 Millimetres
• Record '00' to indicate the Tumour or Lesion is not assessable for diffuse Tumours (e.g. gliomatosis cerebri).

This data element is also known by these names:

Context	Alias
formerly	INVASIVE LESION SIZE (RADIOLOGICAL DETERMINATION)
plural	LESION SIZES (RADIOLOGICAL)