Postoperative retroperitoneal hematoma following transforaminal percutaneous endoscopic lumbar discectomy.
OBJECTIVE
The purpose of this study was to demonstrate the clinical characteristics of postoperative retroperitoneal hematoma (RPH) following transforaminal percutaneous endoscopic lumbar discectomy (PELD) and to discuss how to prevent the complication of unintended hemorrhage.


METHODS
The medical records of 412 consecutive patients treated with transforaminal PELD between January 2005 and May 2007 were reviewed. A total of 4 patients (0.97%) experienced symptomatic postoperative RPH. The clinical outcomes were evaluated using the visual analog scale and the Oswestry Disability Index.


RESULTS
The common symptom in all patients with a hematoma was inguinal pain. The mean hematoma volume was 527.9 ml (range 53.3-1274.1 ml). Two patients with massive diffuse-type RPHs compressing the intraabdominal structures required open hematoma evacuation performed by general surgeons, and the other 2 patients with small, localized RPHs of < 100 ml were treated conservatively. The mean follow-up period was 21.3 months (range 13-29 months). The mean visual analog scale score for radicular leg pain improved from 7.6 to 1.8 and that for back pain improved from 4.3 to 2. The mean Oswestry Disability Index improved from 58.8 to 9.1%. The preoperative symptoms improved after the second treatment without significant neurological sequelae in all patients.


CONCLUSIONS
Although transforaminal PELD is a minimally invasive and safe procedure, the possibility of RPH should be kept in mind. Adequate technical and anatomical considerations are important to avoid this unusual hemorrhagic complication, especially in the patient with underlying medical problems or previous operative scarring. A high index of suspicion and early detection is also important to avoid the progression of the hematoma.
Ahn
Yong
Y
Department of Neurosurgery, Wooridul Spine Hospital, Seoul, Korea. ns-ay@hanmail.net
Kim
Jin Uk
JU
Lee
Byung Hoi
BH
Lee
Sang-Ho
SH
Park
Jong Dae
JD
Hong
Dong Hyun
DH
Lee
June Ho
JH
D000328:Adult; D017587:Diskectomy, Percutaneous / Q000009:adverse effects*; D004724:Endoscopy / Q000009:adverse effects*; D005260:Female; D006406:Hematoma / Q000473:pathology*; D006801:Humans; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D008159:Lumbar Vertebrae / Q000098:blood supply / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000209:etiology / Q000473:pathology* / Q000517:prevention & control; D012187:Retroperitoneal Space / Q000473:pathology