The largest clinical in-situ measurement of the diameter of the skin cancer lesion in millimetres.

For Malignant Melanoma, the largest diameter may influence whether a diagnostic biopsy is taken first and may determine the complexity of the surgical excision. For other tumours, the largest diameter may influence the choice of treatment modality.

References:
National Cancer Data Set Version 2.1_ISB October 2002 

This attribute is also known by these names:

Context	Alias
plural	SKIN CANCER LARGEST CLINICAL DIAMETERS