Olecranon Bursitis Communicating With an Olecranon Cyst in Rheumatoid Arthritis
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1 Case Report Olecranon Bursitis Communicating With an Olecranon Cyst in Rheumatoid Arthritis Wook Jin, MD, Jae Hoon Lee, MD, Dal Mo Yang, MD, Hyun Cheol Kim, MD, Chang Woo Ryu, MD, Hyun Phil Shin, MD, Ji Seon Park, MD, Kyung Nam Ryu, MD Nonseptic inflammation of the olecranon bursa is frequent because of its superficial location. 1 This olecranon bursitis can be due to variable causes such as trauma, overuse, inflammatory arthropathy, chronic degenerative osteoarthritis, rheumatoid arthritis (RA), and gout. 2 4 A cyst (or geode) is a subarticular cystic lesion, and this is often seen in osteoarthritis and RA. 5 Other forms of arthritis, such as hemophilia, calcium pyrophosphate deposition disease, and gout, can show cysts. 5 7 These cysts are usually small but can enlarge and reach 5 or 6 cm in diameter. 8 Although cysts are common in RA, cysts occurring in the olecranon have been rarely reported, 9 12 and most of them were related to spontaneous fractures through olecranon cysts To our knowledge, a report of communication between olecranon bursitis and an olecranon cyst has not been reported in the English literature. We present a case of olecranon bursitis in a 23-year-old rheumatoid patient in which communication with an olecranon cyst was confirmed on sonography and at surgery. On color scale sonography, compression with the ultrasound transducer on the bursa was useful for confirming the communication between the olecranon bursa and the cyst by observation of the color flow signal. Case Report Abbreviations MRI, magnetic resonance imaging; RA, rheumatoid arthritis Received January 18, 2007, from the Departments of Radiology (W.J., D.M.Y., H.C.K., C.W.R.), Orthopedic Surgery (J.H.L.), and Internal Medicine (H.P.S.), East- West Neo Medical Center, College of Medicine, and Department of Radiology, Kyung-Hee Medical Center, College of Medicine (J.S.P., K.N.R.), Kyung- Hee University, Seoul, Korea. Revision requested February 12, Revised manuscript accepted for publication February 21, Address correspondence to Wook Jin, MD, Department of Radiology, East-West Neo Medical Center, 149 Sangil-dong, Kangdong-gu, Seoul , Korea. jinooki@hitel.net A 23-year-old woman had pain, swelling, and a soft, palpable, masslike lesion in the left elbow. She had known RA with polyarthralgia, especially in both wrists and the left elbow, for 3 years. Radiographs of the left elbow joint (Figure 1) showed a large cystic lesion in the olecranon of the ulna and elbow changes consistent with RA. In the olecranon, a relatively well-defined osteolytic lesion with a narrow transitional zone, a thin sclerotic rim, and inner bony ridges or septations was shown. There was no matrix calcification or periosteal reaction. In addition, anterior joint capsular distension and posterior soft tissue bulging were noted. The changes suggested an olecranon cyst as the underlying abnormality, but a differential diagnosis such as a giant cell tumor or other bone tumor had to be included by the American Institute of Ultrasound in Medicine J Ultrasound Med 2007; 26: /07/$3.50
2 Olecranon Bursitis in Rheumatoid Arthritis Figure 1. Radiograph (lateral view) of the left elbow shows a relatively welldefined osteolytic lesion in the olecranon. Soft tissue swelling (white arrows) is shown in the posterior aspect of elbow, and anterior joint capsular bulging (black arrows) is suggested. On sonography (Figure 2), olecranon bursitis was noted, with inner marked synovial hypertrophies, an echogenic fluid collection, and septations. In addition, a communication between the olecranon bursitis and the intramedullary portion of the olecranon was shown through a posterior cortical defect of the olecranon. To-and-fro flow movements were noted through this cortical defect on compression with the ultrasound transducer, and this finding was noted as movement of echogenic material on gray scale sonography and a color flow signal on color scale sonography. In addition, irregular cortical margins, subchondral erosions, a hypertrophied, echogenic synovium with hypervascularity, and joint effusion were shown in the elbow joint. These findings suggested prominent and chronic synovitis such as RA. Magnetic resonance imaging (MRI) was then performed. A Figure 2. A, Transverse sonogram shows the olecranon bursa (B) with inner echogenic material. A posterior cortical defect (arrow) of the olecranon (O) is also shown. B, Longitudinal sonogram shows echogenic material and posterior enhancement (arrows) from the bursa (B) in the intraosseous portion of the olecranon (O). C, Transverse color scale sonogram shows a color flow signal (F) from to-and-fro movements of inner fluid and debris through the cortical defect (communication between the bursa and geode) on compression with the transducer. B C 858 J Ultrasound Med 2007; 26:
3 Jin et al On MRI (Figure 3), it was possible to easily see that the osteolytic lesion in the olecranon was a cyst. Magnetic resonance imaging also showed the presence of communications between the bursitis and the cyst and between the cyst and the articular joint space of the elbow. The patient underwent open synovectomy, removal of the bursa, and careful curettage of the cyst with autogenous iliac bone grafts to relieve the elbow arthritis with bursitis and to prevent a pathologic fracture. During surgery, marked synovial hypertrophy and rice bodies were visible all over the elbow joint. The bursa was distended with inner fluid and inflammatory granulelike tissue, and the cyst was filled with an extensive granulationlike appearance of the tissue. In addition, there were communications between the olecranon bursitis and the olecranon cyst and between the olecranon cyst and the articular elbow joint space. Histologic examination of the tissue in the bursa and cyst revealed nonspecific chronic inflammation similar to a pannus, with lymphoplasmacytic infiltration and eosinophilic nodular proliferation. There was no bacterial growth on a culture of aspirated fluid. The postoperative course of the patient was uneventful, and she was asymptomatic with no radiologic findings of recurrence at the 5-month follow-up. Figure 3. A. Sagittal proton-weighted fat-suppressed MRI (repetition time, 2200 milliseconds; echo time, 20 milliseconds) shows a large cyst (C) in the olecranon. A communication (arrow) between the cyst and the articular joint space is clearly shown. There are synovial changes and subchondral changes in the elbow joint with joint capsular bulging. B, Enhanced axial T1-weighted fat-suppressed MRI (repetition time, 600 milliseconds; echo time, 20 milliseconds) shows a communication between the olecranon bursa (B) and the olecranon cyst (C) through a posterior cortical defect. Thick peripheral enhancements are shown in the walls of the cyst and bursa. Thick and irregular synovial enhancements (arrows) are visible in the elbow joint space. A Discussion The olecranon bursa is a subcutaneous space lined with a synovial membrane that secretes fluid to provide smooth and almost frictionless motion between the skin, the subcutaneous tissues, and the olecranon. Nonseptic olecranon bursitis can be due to overuse, repetitive trauma, inflammatory arthropathy, or obesity. 1 In addition, diseases that lead to a complicated aspect of affected and noninfected bursae include chronic degenerative arthritis, repetitive trauma, acute trauma, RA, and gout. 1 Bursitis can be diagnosed by sonography, computed tomography, and MRI. On these imaging modalities, a fluid collection with lobulation, septation, complexity, wall thickening, adjacent joint effusion, soft tissue edema, and wall enhancement posterior to the olecranon can indicate a diagnosis of olecranon bursitis. 1 B J Ultrasound Med 2007; 26:
4 Olecranon Bursitis in Rheumatoid Arthritis The term geode was originally a geologic term meaning a rounded pocket of gas in a mineral specimen. 5,13 Geode (or cyst) is used interchangeably with subchondral cyst and can be subarticular, subchondral, or synovial. 7 Cyst formation is most commonly associated with osteoarthritis but is also associated with other forms of arthritis such as RA, hemophilia, calcium pyrophosphate deposition disease, and gout. 7 In RA, the commonly affected sites by cysts are the tibial plateau and the femoral neck. 13,14 Large cysts may be confused with other destructive lesions that develop close to joints. These include osteomyelitis, septic arthritis, pigmented villonodular hyperplasia, hemophilia, and tumors such as giant cell tumors and metastases. 7 Although the mechanism of cyst formation has not been made clear, 2 theories have been suggested. 7,13 One is that the pannus, arising from the synovial membrane under inflammatory conditions, causes destruction of articular cartilage and extends to the subchondral bone. At this time, the pannus becomes a cyst, with increased pressure from the joint cavity being transmitted to subchondral space. 15 In this theory, communication between the articular cavity and the cyst may be essential. Actually, there were communications between cysts and joint cavities in surgically proven and image-based reports by Maher et al, 5 Torikai et al, 12 and Lohse et al. 16 Another theory involves the development of true intraosseous rheumatoid nodules in the subchondral regions. 13,17 In our case, a cortical defect between the nonarticular cortex of the olecranon and the olecranon bursa was present. In addition, there were several cortical defects in the articular side of the olecranon, showing communications with the articular cavity and the cyst. Therefore, we think that first the cyst formation was made from invagination of the intra-articular synovium into the olecranon; the second inflammatory synovium in the cyst eroded the posterior olecranon cortex; and then a communication between the olecranon cyst and the olecranon bursa was formed, rather than secondary cyst formation after direct erosion of the posterior olecranon cortex by the inflammatory olecranon bursa. We think that detection of communications between an olecranon cyst and a bursa/articular joint is important because communications through the cortex are weak areas, and these can be beginnings of cortical fractures. In addition, more careful procedures are needed to prevent intraoperative fractures and recurrence of intraosseous cysts and superficial bursitis in these areas during the curettage and bone grafting. In conclusion, we report unusual findings of communication between the olecranon bursa and an olecranon cyst confirmed by sonography before MRI and surgery. On color scale sonography, compression with the ultrasound transducer on the bursa was useful for confirming the communication between the olecranon bursa and the cyst by observation of the color flow signal. References 1. Floemer F, Morrison WB, Bongartz G, Ledermann HP. MRI characteristics of olecranon bursitis. AJR Am J Roentgenol 2004; 183: Ho G Jr, Tice AD, Kaplan SR. Septic bursitis in the prepatellar and olecranon bursae: an analysis of 25 cases. Ann Intern Med 1978; 89: Shell D, Perkins R, Cosgarea A. Septic olecranon bursitis: recognition and treatment. J Am Board Fam Pract 1995; 8: Graif M, Schweitzer ME, Deely D, Matteucci T. The septic versus nonseptic inflamed joint: MRI characteristics. Skeletal Radiol 1999; 28: Maher MM, Kennedy J, Hynes D, Murray JG, O Connell D. Giant distal humeral geodes. Skeletal Radiol 2000; 29: Hirose T, Kurosawa H, Sakuraba K, Nozawa M, Matsuda K. Giant geode as the differential diagnosis of a large lobular radiolucency in the distal femur of a patient with rheumatoid arthritis. J Rheumatol 1999; 26: Bullough PG, Bansal M. The differential diagnosis of geodes. Radiol Clin North Am 1988; 26: Renton P. Lytic lesions. In: Renton P (ed). Orthopedic Radiology: Pattern Recognition and Differential Diagnosis. 1st ed. Chicago, IL: Year Book Medical Publishers; 1990: Magyar E, Talerman A, Feher M, Wouters HW. Giant bone cysts in rheumatoid arthritis. J Bone Joint Surg Br 1974; 56: Rappoport AS, Sosman JL, Weissman BN. Spontaneous fractures of the olecranon process in rheumatoid arthritis. Radiology 1976; 119: J Ultrasound Med 2007; 26:
5 Jin et al 11. Wordsworth BP, Mowat AG, Watson NA. Fracture through a geode in the proximal ulna. Br J Rhematol 1984; 23: Torikai E, Kageyama Y, Sugiyama E, Ogiwara Y, Irisawa S, Nagono A. The occurrence of a geode in the olecranon of a patient with rheumatoid arthritis. Arch Orthop Trauma Surg 2006; 126: Resnick D, Niwayama G, Coutts RD. Subchondral cysts (geodes) in arthritic disorders: pathologic and radiographic appearance of the hip joint. AJR Am J Roentgenol 1977; 128: Rennell C, Mainzer F, Mults CV, Genant HK. Subchondral pseudocysts in rheumatoid arthritis. AJR Am J Roentgenol 1977; 129: Jayson MI, Dixon AS, Yeoman P. Unusual geodes (bone cysts) in rheumatoid arthritis. Ann Rheum Dis 1972; 31: Lohse A, Carbillet JP, Onimus M, Stevenel F, Toussirot E, Wendling D. Giant intraosseous cyst-like lesions in rheumatoid arthritis: report of a case. Joint Bone Spine 2003; 70: Ginsberg MH, Genant HK, Yu TF, McCarty DJ. Rheumatoid nodulosis: an unusual variant of rheumatoid disease. Arthritis Rheum 1975; 18: J Ultrasound Med 2007; 26:
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