Table 1. Characteristics of patients.

Case no.	Age (yr)/sex	Location	Size (cm)	Duration	Previous therapy	Symptom	Nail deformity
1	68/M	Lt. 3rd finger NF	0.5×0.5	10 yr	Cryotherapy #2	Tenderness	Longitudinal groove
2	63/M	Lt. 4th finger NF	0.5×0.5	1 yr	None	None	Umbilication
3	62/M	Lt. 3rd finger DIPJ	0.6×0.5	1 yr	None	Tenderness	None
4	70/M	Lt. 1st toe MTPJ	0.7×0.7	10 mo	Multiple aspiration	Tenderness	None
5	66/M	Rt. 3rd finger DIPJ	0.4×0.2	1 yr	Multiple aspiration	None	None
6	62/M	Rt. 1st finger IPJ	1.1×0.5	NA	None	None	None
7	77/M	Rt. 1st finger IPJ	0.3×0.3	3 yr	Multiple aspiration	None	None
8	82/M	Lt. 1st finger NF	0.5×0.5	5 mo	Multiple aspiration	None	None
9	55/F	Rt. 1st toe IPJ	0.6×0.2	1 yr	Multiple aspiration	Tenderness	None
10	68/M	Rt. 3rd finger DIPJ	0.7×0.5	2 yr	Multiple aspiration	None	None
11	72/M	Rt. 2nd toe DIPJ	0.2×0.2	8 mo	Cryotherapy #4	None	None
12	64/M	Lt. 4th toe DIPJ	0.3×0.3	2 yr	Multiple aspiration	None	None
13	67/M	Lt. 1st finger IPJ	0.4×0.2	4 mo	Multiple aspiration	None	None
14	64/M	Rt. 3rd finger NF	0.5×0.4	NA	Multiple aspiration	None	Umbilication
15	65/F	Rt. 1st finger IPJ	0.6×0.5	2 yr	None	None	None
16	63/M	Rt. 2nd finger IPJ	1.2×0.6	NA	None	None	None
17	53/F	Rt. 2nd finger DIPJ	0.4×0.3	NA	Sclerotic agent	Tenderness	Umbilication
18	79/M	Rt. 3rd finger DIPJ	0.6×0.5	2 mo	None	None	None
19	69/M	Rt. 2nd toe DIPJ	0.3×0.2	1 yr	None	None	None
20	66/M	Rt. 3rd finger DIPJ	0.5×0.5	3 yr	Multiple aspiration	None	None
21	64/M	Rt. 3rd finger DIPJ	0.7×0.4	1 yr	None	None	Umbilication
22	71/M	Lt. 1st finger IPJ	1.3×0.5	5 mo	None	None	None
23	67/M	Rt. 1st finger IPJ	1.0×0.5	2 yr	None	None	Umbilication
24	79/M	Rt. 3rd finger NF	0.3×0.4	1 yr	None	None	Longitudinalgroove

M: male, F: female, Lt.: left, Rt.: right, NF: nail fold, DIPJ: distal interphalangeal joint, MTPJ: metatarsalphalangeal joint, IPJ: interphalangeal joint, NA: not available.