Pigmented villonodular synovitis of the knee in a 9-year-old child.
Abstract: This report describes a 9-year-old girl with pigmented villonodular synovitis pigmented vil·lo·nod·u·lar synovitis
Diffuse outgrowths of the synovial membrane of a joint, usually the knee.
pigmented villonodular synovitis of the right knee. She presented with a chronic bloody effusion of the knee. The diagnosis of pigmented villonodular synovitis was suggested by the findings on magnetic resonance imaging magnetic resonance imaging (MRI), noninvasive diagnostic technique that uses nuclear magnetic resonance to produce cross-sectional images of organs and other internal body structures. and confirmed at the time of arthroscopic synovectomy. This report emphasizes the importance of considering pigmented villonodular synovitis in the differential diagnosis of chronic hemarthrosis in children.
Key Words: hemarthrosis, pigmented villonodular synovitis, synovectomy
Pigmented villonodular synovitis (PVS PVS 1 Persistent vegetative state, see there 2. Pulmonary valve stenosis ) is a benign but locally aggressive proliferative lesion of the synovial membrane. Monoarticular involvement is the rule, and the knee is the most commonly affected joint. (1), (2) PVS should be suspected in a patient with a chronic joint effusion in whom arthrocentesis yields bloody or brownish synovial fluid. PVS is a rare disorder, with a reported incidence of 1 to 2 per million. (3) PVS occurs most commonly in young adults. It is quite rare in children. This report describes a 9-year-old child with PVS of the knee, and it serves to emphasize the importance of considering PVS in the differential diagnosis of hemarthrosis in children.
The patient in this report presented with a chronic hemarthrosis associated with a large effusion of the right knee. The diagnosis of PVS was suggested by the clinical presentation and MRI 1. (application) MRI - Magnetic Resonance Imaging.
2. MRI - Measurement Requirements and Interface. findings. The diagnosis was confirmed histologically in synovial synovial /sy·no·vi·al/ (-al)
1. pertaining to a synovial membrane.
2. pertaining to or secreting synovia.
of, pertaining to, or secreting synovia. tissue obtained at the time of total synovectomy. The patient has experienced a gratifying response to surgical therapy of the PVS.
PVS is a benign proliferative lesion of the synovial membrane. (1), (2) Monoarticular involvement of a knee is the most common clinical presentation. (1), (2) PVS is a rare disorder with a prevalence of 1 to 2 per million. (3) It generally affects young adults. (3) It is particularly rare in children. (4) With the exception of her young age, the patient in the present report had a fairly typical presentation of PVS. She had a chronic, large effusion of one knee with swelling out of proportion to pain and evidence of inflammation. She had bloody synovial fluid despite no evidence of associated bleeding diathesis.
[FIGURE 1 OMITTED]
The diagnosis of PVS was suggested by the clinical presentation and by the findings on MRI. The MRI showed a large effusion with scattered hemosiderin hemosiderin /he·mo·sid·er·in/ (he?mo-sid´er-in) an insoluble form of tissue storage iron, visible microscopically both with and without the use of special stains.
n. deposits. The presence of hemosiderin is considered the most characteristic feature of PVS on MRI. (1) This finding is not pathognomonic pathognomonic /pa·thog·no·mon·ic/ (path?ug-no-mon´ik) specifically distinctive or characteristic of a disease or pathologic condition; denoting a sign or symptom on which a diagnosis can be made. for PVS, however. Arthropathy arthropathy /ar·throp·a·thy/ (ahr-throp´ah-the) any joint disease.arthropath´ic
Charcot's arthropathy neuropathic a. secondary to clotting disorders such as hemophilia and von Willebrand disease Von Willebrand Disease Definition
Von Willebrand disease is caused by a deficiency or an abnormality in a protein called von Willebrand factor and is characterized by prolonged bleeding. must be excluded by appropriate laboratory evaluation. In addition, he moglobinopathies may rarely present as a hemarthrosis. (5)
Grossly, PVS is characterized by thick, plush synovium with long, delicate villi villi: see digestive system. . The synovial villi are orange or reddish-brown in color. (1), (2) PVS may invade the joint capsule and produce erosions of the adjacent cartilage and bone. PVS is characterized by synovial hyperplasia and subsynovial accumulation of histiocytes, multinucleated multinucleated
characterized by having more than one nucleus per cell.
multinucleated giant cell
see giant cell. giant cells, and macrophages containing hemosiderin. In addition to intracellular hemosiderin, there are often extracellular deposits of hemosiderin. (1), (2)
The cause of PVS is unknown. Given the frequent finding of bloody synovial fluid and synovial hemosiderin deposits, chronic or repetitive hemarthrosis represents an attractive cause of PVS. However, the gross and histologic features of PVS differ from hemophilic hemophilic /he·mo·phil·ic/ (-fil´ik)
1. having an affinity for blood; in bacteriology, growing well in culture media containing blood or having a nutritional affinity for constituents of fresh blood.
2. arthropathy. (6) Moreover, injecting blood or iron into the joints fails to produce all of the clinical and histologic features of PVS. (7), (8) Emerging data suggest that PVS represents a usually benign neoplasm neoplasm or tumor, tissue composed of cells that grow in an abnormal way. Normal tissue is growth-limited, i.e., cell reproduction is equal to cell death. . The tendency to recur after subtotal synovectomy supports the neoplastic neoplastic /neo·plas·tic/ (ne?o-plas´tik)
1. pertaining to a neoplasm.
2. pertaining to neoplasia.
pertaining to neoplasia or a neoplasm. theory. More recently, clonal and chromosomal abnormalities in PVS cells have lent support to the neoplastic theory. (9), (10) Rare instances of metastatic PVS suggest that the neoplastic synovium may not always be benign. (11), (12)
The treatment of diffuse PVS is total synovectomy via an open approach or via arthroscope. With either approach, it is difficult to remove all of the synovium, resulting in a risk of recurrence. Some have therefore advocated surgical synovectomy combined with adjunctive radiosynovectomy. (13) The patient in this report did not have adjunctive radioactive therapy because of her age and the potential to affect growth in the radiated joint. As exemplified by the patient in this report, the functional prognosis is good after total synovectomy. (14)
This report describes PVS of the knee in a 9-year-old girl who presented with chronic, painless bloody effusion of a single knee. It serves to emphasize that PVS should be considered in the differential diagnosis of chronic hemarthrosis in children.
Common-sense nerve fibers are seldom medullated medullated /med·ul·lat·ed/ (med´ah-lat?ed) myelinated.
2. Having a medulla.
1. before forty--they are never seen even with a microscope before twenty.
From the Division of Immunology and Rheumatology, Department of Pediatrics, University of Virginia Health System, Charlottesville, VA.
The author has no commercial or proprietary interest in any drug, device, or equipment mentioned in this article. I have no financial interest in any item mentioned in this article. I received no financial support from grants or contracts or provision of supplies to write this article.
Reprint requests to Frank T. Saulsbury, MD, Department of Pediatrics, University of Virginia Health System, Box 800386, Charlottesville, VA 22908. Email: email@example.com
Accepted September 30, 2003.
Copyright [C] 2004 by The Southern Medical Association 0038-4348/04/9701-0080
(1.) Bravo SM, Winalski CS, Weissman BN. Pigmented villonodular synovitis. Radiol Clin North Am 1996;34:311-326, x-xi.
(2.) Durr HR, Stabler A, Maier M, et al. Pigmented villonodular synovitis: Review of 20 cases. J Rheumatol 2001;28:1620-1630.
(3.) Myers BW, Masi AT. Pigmented villonodular synovitis and tenosynovitis tenosynovitis /teno·syn·o·vi·tis/ (-sin?o-vi´tis) inflammation of a tendon sheath.
villonodular tenosynovitis : A clinical epidemiologic study of 166 cases and literature review. Medicine (Baltimore) 1980;59:223-238.
(4.) Hoeffel JC, Mainard L, Champigneulle J, et al. Pigmented villonodular synovitis of the wrist in childhood. Clin Pediatr (Phila) 1997;36:423-426.
(5.) Glickstein SL, Melton JW III, Katz P. Sickled cells in synovial fluid: Clue to unsuspected hemoglobinopathy hemoglobinopathy
Any of a group of disorders caused by genetic abnormality of the hemoglobin molecule. The most prominent types are sickle-cell anemia and thalassemia, a set of disorders whose symptoms range from none to fatal anemia. . South Med J 1989;82:769-771.
(6.) Roosendaal G, van Rinsum AC, Vianen ME, et al. Haemophilic arthropathy resembles degenerative rather than inflammatory joint disease. Histopathology 1999;34:144-153.
(7.) Singh R, Grewal DS, Chakravarti RN. Experimental production of pigmented villonodular synovitis in the knee and ankle joints of rhesus monkeys. J Pathol 1969;98:137-142.
(8.) Roosendaal G, TeKoppele JM, Vianen ME, et al. Blood-induced joint damage: A canine in vivo study. Arthritis Rheum 1999;42:1033-1039.
(9.) Ray RA, Morton CC, Lipinski KK, et al. Cytogenetic evidence of clonality in a case of pigmented villonodular synovitis. Cancer 1991;67:121-125.
(10.) Fletcher JA, Henkle C, Atkins L, et al. Trisomy trisomy /tri·so·my/ (tri´so-me) the presence of an additional (third) chromosome of one type in an otherwise diploid cell (2n + 1). See also entries under syndrome. triso´mic
n. 5 and trisomy 7 are nonrandom aberrations in pigmented villonodular synovitis: Confirmation of trisomy 7 in uncultured cells. Genes Chromosomes Cancer 1992;4:264-266.
(11.) Choong PF, Willen H, Nilbert M, et al. Pigmented villonodular synovitis: Monoclonality and metastasis--a case for neoplastic origin? Acta Orthop Scand 1995;66:64-68.
(12.) Bertoni F, Unni KK, Beabout JW, et al. Malignant giant cell tumor of the tendon sheaths and joints (malignant pigmented villonodular synovitis). Am J Surg Pathol 1997;21:153-163.
(13.) Shabat S, Kollender Y, Merimsky O, et al. The use of surgery and yttrium yttrium (ĭt`rēəm) [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.9059; m.p. about 1,522°C;; b.p. 3,338°C;; sp. gr. about 4.45; valence +3. Yttrium is a highly crystalline iron-gray metal. 90 in the management of extensive and diffuse pigmented villonodular synovitis of large joints. Rheumatology (Oxford) 2002;41:1113-1118.
(14.) de Visser E, Veth RP, Pruszczynski M, et al. Diffuse and localized pigmented villonodular synovitis: Evaluation of treatment of 38 patients. Arch Orthop Trauma Surg 1999;119:401-404.
RELATED ARTICLE: Key Points
* Pigmented villonodular synovitis is a benign but locally aggressive proliferative lesion of the synovial membrane.
* Pigmented villonodular synovitis most commonly presents as a large, bloody effusion of one knee.
* Magnetic resonance imaging in pigmented villonodular synovitis shows synovial hyperplasia and hemosiderin deposition.
* The treatment of pigmented villonodular synovitis is total synovectomy.
RELATED ARTICLE: Case Report
A 9-year-old girl presented with a 1-year history of a swollen right knee. Although the knee was markedly swollen, she did not complain of pain, stiffness, or restricted motion of the knee. There was no history of fever or other symptoms suggestive of an underlying rheumatic disease.
Eight months before presentation, the patient was diagnosed as having pauciarticular juvenile rheumatoid arthritis juvenile rheumatoid arthritis
n. Abbr. JRA
Chronic inflammatory arthritis that begins in childhood, characterized by swelling, tenderness, and pain in one or more joints and by lymph node and splenic enlargement. . She was treated with ibuprofen in a dose of 30 mg/kg/d. Despite treatment, the large effusion of the right knee persisted. An arthrocentesis was performed, and it yielded grossly bloody synovial fluid. A cell count was not performed, but cultures of the fluid were negative. Magnetic resonance imaging (MRI) of the right knee showed a large effusion, hyperplasia of the synovium, and scattered hemosiderin deposits (Fig. 1). She was then referred for further evaluation.
Physical examination revealed a very large effusion of the right knee. The right knee was slightly warmer than the left knee, but it was not erythematous or tender to palpation palpation /pal·pa·tion/ (pal-pa´shun) the act of feeling with the hand; the application of the fingers with light pressure to the surface of the body for the purpose of determining the condition of the parts beneath in physical diagnosis. . The range of motion of the right knee was normal. The remainder of the physical examination was normal.
The laboratory evaluation revealed a white blood cell count white blood cell count,
n a diagnostic clinical laboratory test to determine the number and types of leukocytes present in a measured sample of blood. Overall the normal number of leukocytes ranges from 5000 to 10,000/mm3. of 8,800 cells/[micro]l with 56% neutrophils and 40% lymphocytes. The hemoglobin concentration was 12.3 g/dl, and the platelet count was 322,000 cells/[micro]l. The erythrocyte sedimentation rate Erythrocyte Sedimentation Rate Definition
The erythrocyte sedimentation rate (ESR), or sedimentation rate (sed rate), is a measure of the settling of red blood cells in a tube of blood during one hour. was 17 mm/h. Tests for rheumatoid factor, antinuclear antibody, HLA-B27, and Lyme disease were all negative. The prothrombin time, partial thromboplastin time Partial Thromboplastin Time Definition
The partial thromboplastin time (PTT) test is a blood test that is done to investigate bleeding disorders and to monitor patients taking an anticlotting drug (heparin). , plasma fibrinogen concentration, von Willebrand factor von Willebrand factor (vWF)
A protein found in the blood that is involved in the process of blood clotting.
Mentioned in: Von Willebrand Disease
von Willebrand factor antigen concentration, Factor VIII activity, and ristocetin cofactor cofactor
An atom, organic molecule, or molecular group that is necessary for the catalytic activity (see catalysis) of many enzymes. A cofactor may be tightly bound to the protein portion of an enzyme and thus be an integral part of its functional structure, or it may activity were all normal. A repeat arthrocentesis again yielded grossly bloody synovial fluid with a hematocrit value of 6%. A cell count of the synovial fluid was not performed. A presumptive diagnosis of PVS was made, and the patient underwent arthroscopy of the right knee.
At arthroscopy, lush, pigmented synovial villi were seen. A total synovectomy was performed. Histologic findings in the resected synovium revealed synovial hyperplasia with subsynovial accumulation of mononuclear cells, giant cells, and numerous hemosiderin-laden macrophages.
The patient experienced gradual resolution of the effusion after the synovectomy. One year after the synovectomy, the patient had a very small residual effusion of the right knee. She had no pain or limitation of motion. She was fully functional and normally active.
Frank T. Saulsbury, MD