Postoperative discal pseudocyst and its similarities to discal cyst: A case report

Table 1 Patients with pseudocyst after lumbar discectomy

Citation	Patients	Age/gender	Previous operation	Country	Days till symptom aggravation (d)	Days till MRI detection (d)	Treatment of PDP
Young et al[1], 2009	2	60/M; 38/M	MED; partial discectomy	US	30; 60	390; 420	No treatment; conservative
Kang et al[4] and Park et al[18]	15	20-25 M, mean 22.5	PELD	Korea	N/A	53.7	5 surgical (1 OC, 4 PELC); 10 conservative
Chung et al[2], 2012	12	11 M, 1 F, mean 29.3	9/12 MED; 3/12 PELD	Korea	Mean 23.3 (range, 9–38)	Mean 31.2 (range, 14–60)	5 surgical (UA); 7 conservative
Jha et al[6], 2016	2	16/M; 18/F	MED; MED	Japan	7; 7	30; 60	Conservative; conservative
Yu et al[3], 2016	1	27/M	Open discectomy	Korea	14	21	Conservative
Prasad and Menon[7], 2017	1	30/M	Discectomy	Indian	25	25	OC
Shiboi et al[8], 2017	2	14/F; 27/M	PELD; PELD	Japan; Japan	30; 20	30; 20	PELC; MED
Manabe et al[5], 2019	1	21/M	PELD	Japan	42	42	PELC
Present cases	1	23/M	PELD	China	40	40	Conservative

M: Male; F: Female; PDP: Postoperative discal pseudocyst; MED: Micro-endoscopic discectomy; PELD: Percutaneous endoscopic discectomy; MEC: Micro-endoscopic cystectomy; PELC: Percutaneous endoscopic cystectomy; OC: Open cystectomy: UA: Unknown approach.

Table 2 Comparison of histological results between discal cyst and post-discectomy pseudocyst cases since 2009

Location	Results	DC	PDP
Cyst wall	Dense fibrous connective tissue without specific lining cell layer	12 cases[9-19]	2 cases[2,7]
	N/A	1 case[20]	2 cases[3,8]
Content	Serous bloody fluid	8 cases[9-11,13-15,20]	3 cases[2,3,8]
	Clear fluid, similar to spinal fluid	1 case[12]	1 case[7]
	N/A	4 cases[16-19]	0 case
Communicating stalk	Confirmed	13 cases[9-20]	2 cases[2,3]
	N/A	0 case	2 cases[7,8]

DC: Discal cyst; PDP: Post-discectomy pseudocyst; N/A: No histology results.