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J Thorac Cardiovasc Surg 2001;122:1046-1048
© 2001 The American Association for Thoracic Surgery
Brief Communications |
From the Division of Cardiothoracic Surgery, Department of Surgery, Washington University School of Medicine, St Louis, Mo.
Received for publication April 23, 2001. Accepted for publication May 2, 2001. Address for reprints: Joel D. Cooper, MD, Suite 3108 Queeny Tower, One Barnes-Jewish Hospital Plaza, St Louis, MO 63110 (E-mail: cooperjo@ msnotes.wustl.edu).
The surgical literature is replete with case reports of chronic expanding hematomas, that is, ancient hematomas, involving almost every organ system; however, a paucity of information exists concerning this entity arising from the thorax except for that found in several Japanese reports.
1 In a majority of these cases, a remote surgical procedure for tuberculosis seemed to be the initiating factor. As with all chronic expending hematomas, symptoms may arise months or years after trauma or surgery. When first noted, these lesions frequently are thought to represent soft tissue sarcomas or other malignant tumors. 2 Characteristic of this entity is the fact that our patient had a latent period of 30 years before the onset of symptoms.
Clinical summary
A 57-year-old white man had undergone a right lower lobectomy followed by a completion pneumonectomy for tuberculosis 30 years earlier. After a brief recuperative period, he had returned to a physically demanding occupation that he pursued until 1 year before admission for increasing shortness of breath in 1998. In 1986, the patient had angina and underwent a balloon angioplasty.
A chest radiograph taken in 1987 (Figure 1) revealed an opacified right pleural space with a mediastinal shift to the operative side, as would be anticipated after a right pneumonectomy. Another film taken in 1994 (Figure 2) revealed that the mediastinum had shifted somewhat back toward the midline, but the patient remained free of symptoms. Although the patient had noticed increasing dyspnea during the prior year, an acute exacerbation resulted in his being sent to the Washington University Lung Center in August 1998. A repeat radiologic examination, which included computed axial tomography, revealed a midline mediastinum with compression of the left stem bronchus, a long right bronchial stump, and an opaque right pleural space outlined by irregular masses of calcifications (Figure 3). The previously noted long right stem bronchial stump and marked extrinsic compression of the left stem bronchus were observed via a fiberoptic bronchoscope (Figure 4).
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Since his discharge, the patient has been closely followed up for 2 
years and has continued to do well. Computed assisted tomography performed 1 year after the thoracoscopy and a chest radiograph taken 2 years after the procedure show only those findings again characteristic of a previous right pneumonectomy, similar to the findings noted in 1987.
Discussion
Subdural hematoma has been the most widely reported example of expanding hematoma, and most laboratory investigations have focused on this particular entity.
Two widely held hypotheses have arisen to explain the pathogenesis of these lesions. Gardner, 3 Monroe and Merritt, 4 and others have postulated a breakdown of blood products, which results in an increased osmolality within the lesion and leads to its expansion. Very little data supported these deductions, and Weir, 5 in a series of experiments, found no evidence that an increased osmolality occurred within the capsule of the hematoma, thus negating this concept of pathogenesis. A spun down specimen of pleural fluid from our patient had an osmolality of 295 mOsm, which was well within the normal limits.
Watanabe, Shimada, and Ishii 6 were among the first to demonstrate experimentally a volume increase in hematomas. The well-conceived experiments of Labadie and Glover 7 graphically demonstrated that breakdown products of leukocytes, erythrocytes, hemoglobin, platelets, and fibrin result in an inflammatory process that effectively damages the capillaries of the capsule, thus giving rise to increased fluid production.
Despite the significant calcification in the capsule wall of the hematoma, enough elasticity exists for hematomas to increase in volume over time. With highly vascular granulation tissue interposed between large, sharp, calcified masses, one could postulate that any severe coughing episode might well give rise to intermittent bleeding at the calcium–granulation tissue interface. Thus, intermittent episodes of bleeding may allow a slow progressive increase in the volume of the hematoma without the need to consider the irritant factor of blood.
Although most reports of expanding hematomas suggest radical excision of the capsule as the treatment of choice, we did not subscribe to this method for our patient. When confronted with a postpneumonectomy space of 30 years' duration, we did not think the possible complications and increased morbidity of attempting total capsule excision justified such a procedure, inasmuch as a modification of the second stage of the well-established Clagett procedure would suffice.
References
This article has been cited by other articles:
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  S. Ehara, G. L. Hwang, S. D. Moffat, J. D. Mitchell, and A. N. Leung Chronic Expanding Hematoma: Mystery or Misnomer? Am. J. Roentgenol., July 1, 2004; 183(1): 243 - 244. [Full Text] [PDF]
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 K. Okubo, T. Okamoto, J. Isobe, and Y. Ueno Rupture of a chronic expanding hematoma of the thorax into lung parenchyma J. Thorac. Cardiovasc. Surg., June 1, 2004; 127(6): 1838 - 1840. [Full Text] [PDF]
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