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Mitral Stenosis Together with a Giant Cell Myocarditis Limited to the Left Atrium

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Mitral Stenosis Together with a Giant Cell Myocarditis Limited to the Left Atrium J Clin Pathol: first published as 10.1136/jcp.21.6.750 on 1 November 1968. Downloaded from J. clin. Path. (1968), 21, 750-752 Mitral stenosis together with a giant cell myocarditis limited to the left atrium I. GILLIE AND H. FOX From the Department ofPathology, Manchester University SYNOPSIS A case is described in which mitral stenosis was associated with a giant cell myocarditis; the latter lesion was, however, localized to the left atrium. A quite high proportion of reported cases of giant cell myocarditis have occurred in association with rheumatic heart disease. The nature of this relationship is discussed and it is concluded that, in such cases, the giant cell reaction may represent an unusual myocardial response to rheumatic fever. Recently there have been two reports of giant cell granulomata were also present in which lymphocytes, myocarditis found in left atrial appendage biopsy macrophages, many Langhans type giant cells, and specimens taken during mitral valvotomy (McCrea occasional foreign body type giant cells were seen. and Childers, 1964; Husband and Lannigan, 1965). There was no caseation and there were no Aschoff A similar case is described in this paper in which, bodies or Anitschkow myocytes, but occasional however, necropsy examination showed the unique cells were seen whose appearance suggested thatcopyright. feature of a giant cell myocarditis confined to the they were myocardial cells in the process of trans- left atrium. formation into giant cells. The surviving myocardial fibres were hypertrophied. The pericardium was CASE REPORT normal but the endocardium showed a little fibrous thickening. In August 1967 a 60-year-old widow was admitted to Manchester Royal Infirmary for mitral valvotomy. She NECROPSY had a history of rheumatic fever 15 years previously. http://jcp.bmj.com/ Mitral stenosis and aortic incompetence were first The body was that of a small, thin, elderly white diagnosed four years later in 1956. In 1958 she developed woman. The heart was enlarged and weighed 390 g. paroxysmal nocturnal dyspnoea and atrial fibrillation The left atrial appendicular incision and the left and since that time her disease ran a steady downhill incision were well sutured. The course. In 1963 there was one clinical episode of systemic ventriculotomy embolism in the left popliteal artery which recovered ventricles were hypertrophied (the right ventricular with conservative treatment. On admission her temper- wall measured 13 mm and the left 17 mm), but not dilated whilst both atria were greatly dilated but not ature was 97-50F, WBC 8,300, Hb 11-7 g/100 nml (80%), on September 27, 2021 by guest. Protected and her ESR (Wintrobe) was 27 mm/hr. Following the hypertrophied. The mitral valve, which showed the usual preoperative procedures a routine mitral valvotomy typical macroscopic appearance of rheumatic had been performed, during the course of which a left stenosis, had been split so that it admitted the tips atrial appendage biopsy specimen was taken. Shortly of two fingers. It was diffusely thickened up to 5 mm. after her return to the ward she collapsed and, despite The chordae tendinae were thickened and shortened. resuscitatory attempts, died. The aortic valve was thickened, up to 2 mm, and there were adhesions at the anterolateral commisure. ATRIAL APPENDAGE BIOPSY The tricuspid and pulmonary valves were normal. The myocardium was macroscopically normal. The The appendage appeared normal macroscopically coronary arteries showed a trivial degree of non- and the lumen was free of thrombus. Histologically stenosing atheroma. The right lung weighed 450 g there was widespread patchy myocardial necrosis and the left 280 g. The pulmonary arteries showed with a well-marked interstitial lymphocytic infiltra- a moderate degree of atheroma. There were small tion of the myocardium. In many areas interstitial old infarcts in the spleen, brain, and kidneys but Received for publication 3 April, 1968. otherwise all organs appeared normal. 750 J Clin Pathol: first published as 10.1136/jcp.21.6.750 on 1 November 1968. Downloaded from Mitral stenosis together with a giant cell myocarditis limited to the left atrium 751 copyright. FIG. 1. FIG. 2. FIG. 1. Low-power view of atrial appendage biopsy showing granulomatous lesions. (H and E x 70.) FIG. 2. Higherpower view showing giant cells. (H and E x 400.) Multiple blocks from the myocardium were cases, unknown but a wide variety of possible http://jcp.bmj.com/ studied histologically but only in those from the aetiological factors have been suggested; these left atrium were changes similar to those in the include viral or fungal infections, brucellosis, appendicular biopsy seen. The giant cell granulomata toxoplasmosis, tuberculosis, sarcoidosis, syphilis, were most numerous in that part of the atrium vitamin deficiencies, coronary artery disease, amy- immediately adjacent to the atrial appendage and loidosis, and hypersensitivity reactions (Kean and became fewer and smaller as the A-V ring was Hoekenga, 1952; Zschoch, 1961; McCrea and approached. In the ventricles, right atrium, and Childers, 1964; Whitehead, 1965; O'Donnell on September 27, 2021 by guest. Protected interventricular septum multiple blocks failed to and Mann, 1966). Certainly the cardiac disease has, reveal any evidence at all of an inflammatory lesion in many of the reported cases, been only a local in the myocardium. No evidence of active manifestation of a generalized granulomatous rheumatism was seen but the mitral and aortic disease insofar as granulomata were also present valves showed a diffuse fibrous thickening with in the lungs and other organs (Tesluk, 1956; Long, hyalinization and occasional calcification in which 1961; O'Donnell and Mann, 1966). Heartlesions may no inflammatory cells were present. occur in Wegener's granulomatosis (McCrae and The lungs showed some degree of alveolar wall Childers, 1964), whilst cardiac involvement in fibrous thickening but were otherwise normal. generalized sarcoidosis is well documented (Porter, There were no granulomatous lesions in any organ 1960; Phinney, 1961; Forbes and Usher, 1962), outside of the heart. sufficiently so to have led to the suggestion that all cases of isolated giant cell myocarditis are examples DISCUSSION of localized sarcoid (Rab, Choudhury, and Choud- hury, 1963; Johansen, 1966). Giant cell myocarditis is rare; the cause is, in most Considering the rarity of giant cell myocarditis J Clin Pathol: first published as 10.1136/jcp.21.6.750 on 1 November 1968. Downloaded from 7527L Gillie and H. Fox a surprisingly high proportion of the recorded cases may result in mycoardial damage with a resulting have occurred in association with apparent rheumatic non-specific giant cell reaction. That a giant cell heart disease. Thorbjarnarson and Glenn (1956) reaction may simply be a result of non-specific reported a patient with chronic rheumatic heart muscle stress or damage is supported by the finding disease who died during mitral valvotomy; at ofa giant cell myocarditis limited to a left ventricular necropsy the presence of rheumatic disease was aneurysm (Zeeman, Templeton, Goldburgh, and confirmed by the finding of Aschoff bodies in the Aponte, 1962) and by the observed transition of heart, but a giant cell myocarditis was also present. damaged myocardial cells into giant cells (Parrish, Zschoch (1961) described a 15-year-old boy with 1965). If, however, the giant cell reaction is simply a six-year history of rheumatic heart disease who a non-specific response to muscle stress the finding died during an apparent reactivation of rheumatic of similar lesions in the left ventricular myocardium fever; necropsy examination showed typical of hypertensive patients would be expected and such rheumatic disease of the aortic and mitral valves a finding has not been reported. It is also possible together with a widespread giant cell myocarditis. that the stress exerted on the left atrium in cases of In recent years there have been reports of four cases mitral stenosis predisposes to the localization of a in which giant cell granulomata were found in left hypothetical virus in that site but there is little atrial appendages removed during mitral valvotomy evidence to support this suggestion. Hence, the (McCrea and Childers, 1964; Husband and most probable explanation of the association Lannigan, 1965); in these cases, only the left atrial between mitral stenosis and giant cell myocarditis is appendage was available for study but it was that the latter is, in such cases, an unusual histo- assumed that the findings in this site reflected those logical manifestation of rheumatic myocarditis. elsewhere in the heart and this led to the suggestion This being so, the localization of the lesions in the that the valvular lesions were possibly not rheumatic left atrium would not be unexpected insofar as this but were related to the giant cell myocarditis is the optimal site for the finding of typical (Husband and Lannigan, 1965). rheumatic lesions, ie, Aschoff bodies. This is not to The case described in this paper indicates, how- suggest, of course, that all cases of giant cellcopyright. ever, that the presence of giant cell granulomata in myocarditis are of rheumatic origin but rather that the atrial appendage cannot necessarily be taken as this type of lesion is a non-specific response to many evidence of generalized myocardial disease, for in factors, one of which is possibly rheumatic fever. this case there was a striking localization to the left atrium. Nevertheless, there does appear to be a real, We wish to thank Mr H. F. M. Bassett for the clinical though rare, association between mitral stenosis and details, Professor A. C. P. Campbell in whose department left atrial giant cell lesions. There are several possible this work was done, Miss L. Partington who typed the http://jcp.bmj.com/ explanations for this apparent relationship. First, manuscript, and Mr G. Humberstone for the photo- it is possible that the granulomatous disease causes micrographs.
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