[Table/Fig-2]:

Various large series of published literature on umbilical pilonidal sinus [6–12].

Sl No	Authors	Year of publication	Number of cases	Male patients (%)	Conservative treatment given in % of patients 1st Session 2nd Session
1	Kareem et al., [8]	2013	134	121(90.2)	76.19% 23.8%
2	Sarmast M et al., [9]	2011	51	35(68.6)	90% -
3	Fazeli, MS et al., * [10]	2008	45	39(86.5)	All underwent surgery
4	Coşkun, A et al.,** [6]	2011	31	27(87)	- -
5	Eryilmaz R et al., [7]	2005	26	24(92.3)	96% 8%
6	Abdelnour A et al., [11]	1994	27	26(96.2)	100% 14.8%
7	James H et al., [12]	2000	5	5(100)	75% -

*study based on surgical outcome of UPS

**study based on etiological factors associated with UPS