Table 3.

Level of agreement and types of disagreements from independent review according to MPATH-Dx lexicon (n = 239)

	Reference consensus diagnosis
	Nevus/mild atypia (n = 25)	Moderate atypia (n = 35)	Severe atypia/melanoma in situ (n = 60)	T1a melanoma (n = 58)	T1b melanoma (n = 61)
All three pathologists agreed – n = 115, n (%)	14 (56.0%)	5 (14.3%)	27(45.0%)	23 (39.7%)	46 (75.4%)
The three pathologists did not agree – n = 124, n (%)	11 (44.0%)*	30 (85.7%)†	33 (55.0%)‡	35 (60.3%)§	15 (24.6%)||
Types of disagreement
Different terms/nomenclature	1	0	1	0	1
Threshold differences	8	27	24	18	3
Missed finding	0	1	2	10	6
Contents on slides differ	2	2	4	8	7
Philosophical/conceptual differences	2	3	8	4	0

MPATH-Dx, Melanocytic Pathology Assessment Tool and Hierarchy for Diagnosis.

^*One case had more than 1 type of disagreement.

^†Three cases had more than 1 type of disagreement.

^‡Seven cases had more than 1 type of disagreement.

^§Four cases had more than 1 type of disagreement.

^||Two cases had more than 1 type of disagreement.