Table 1.

Clinical Summary of the patients.

	Age/sex	Symptoms/duration	MRI	F/U time (months)	Follow-up
Case 1	62 F	Sacral pain, radiates to rectal vault/8 months	Multicystic lesions of S1-2, posteriorly invaded extradural, adjacent to thecal sac	27	Asymptomatic, no recurrence on MRI
Case 2	29 F	Lumbosacral pain, radiculopathy, and decrease sensation of Rt. leg and Lt. thigh, decrease perianal sensation, urinary hesitancy, constipation/5 years	Solid-cystic lesions of S2-4, anterior extension	21	Asymptomatic in lumbosacral and radicular pain, subsequent improvement in urinary function, incomplete improvement on perianal sensation, amenorrhea, small residual tumor on MRI, nondisplaced fracture S1
Case 3	39 M	Lumbosacral pain, radiculopathy of Lt. leg, loss sensation of Lt. great toe/2 years	Solid dumbbell shape mass in S1-2, intrasacral	18	Asymptomatic, no recurrence on MRI
Case 4	52 F	Lumbosacral pain, radicular pain of Rt. leg/6 years	Solid mass of S1-2, anterior extension	7	Asymptomatic, small residual tumor with seroma on MRI