title: Piriformis ganglion: An uncommon cause of sciatica.
abstract: Sciatica can occur due to a spinal lesion, intrapelvic tumor, diabetic neuropathy, and rarely piriformis syndrome. The causes of piriformis syndrome vary by a space-occupying lesion. A ganglionic cyst can occur in various lesions in the body but seldom around the hip joint. In addition, sciatica due to a ganglionic cyst around the hip joint has been reported in one patient in Korea who underwent surgical treatment. We experienced two cases of sciatica from a piriformis ganglionic cyst and we report the clinical characterics and progress after non-operative treatment by ultrasonography-guided aspiration. The two cases were diagnosed by magnetic resonance imaging and were treated by ultrasonography-guided aspiration. We followed the patients for more than 6months. The symptoms of piriformis syndrome from the ganglion improved following aspiration and this conservative treatment is a treatment method that can be used without extensive incision or cyst excision.
  
  
  METHODS
  Level IV historical case.
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: wonnypia@hanmail.net.
authors.forename: J H
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: kneedoc@naver.com.
authors.forename: H J
authors.initials: HJ
authors.lastname: Jeong
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: coolhkshin@hanmail.net.
authors.forename: H K
authors.initials: HK
authors.lastname: Shin
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: qortn97@naver.com.
authors.forename: S J
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: htr107@naver.com.
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, 29 Saemunan-ro, Jongno-gu, Seoul, 110 746, Republic of Korea. Electronic address: eugeneos@naver.com.
authors.forename: E
authors.initials: E
authors.lastname: Kim
mesh_terms: D000328:Adult; D005260:Female; D045888:Ganglion Cysts / Q000150:complications* / Q000175:diagnosis; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D055958:Piriformis Muscle Syndrome / Q000209:etiology*; D012585:Sciatica / Q000209:etiology*
keywords: Ganglion; Interventional sonography; Piriformis muscle; Sciatica