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• W2030478808 abstract "A 66-year-old man with a known history of chronic obstructive airway disease was admitted after development of a left pneumothorax. This was treated by the insertion of an apical intercostal tube connected to an underwater sealed drainage system. Chest radiography confirmed complete reexpansion of the left lung, and the drain was removed 48 hours later because no air leak was apparent. During this period, signs and symptoms of a left femoral arterial occlusion developed. This was managed by a femoral embolectomy and intravenous heparin administration. Three weeks after the removal of the intercostal tube, a routine chest radiograph revealed a cystic lesion in the left midlung field with an air-fluid level. Percutaneous needle biopsy of this lesion failed to provide a histologic diagnosis, and results of bronchoscopy were unremarkable. An exploratory minithoracotomy was performed. At operation, a well-defined cystic mass measuring 4 × 6 cm was found “embedded” within the oblique fissure between the left upper and lower lobes (Fig. 1). This mass was “shelled out” intact without difficulty. Postoperative recovery was uneventful, and the patient was discharged 1 week later. On pathologic examination, the lesion was found to be a fibrous-walled cyst containing a blood clot. The cyst wall consisted of organizing blood clot, and there was no evidence of malignancy. The appearance on chest radiography of loculated pleural fluid collections may consist of opacities of varying sizes and shapes that can be difficult to distinguish from a pulmonary parenchymal process.1Rusch VM Pleural effusions: benign and malignant.in: Thoracic surgery. Churchill Livingstone, New York1995: 1003-1016Google Scholar Collections in atypical locations such as the interlobar fissure may be seen as “pseudotumors,” which may normally be recognized by the biconvex lenticular shape and scissural position.2Henscke CI Davis SD Romano RH Yankelowitz DF Pleural effusions: pathogenesis, radiological evaluation, and therapy.J Thorac Imaging. 1989; 4: 49-52Crossref PubMed Scopus (20) Google Scholar In addition, fluid is often present elsewhere within the pleural space in cases of pseudotumor. In the case reported here, however, the appearance was consistent with a cystic lesion without evidence of a pleural collection elsewhere within the thorax. The differential diagnosis of an intrathoracic cystic lesion includes lung abscess, primary bronchial carcinoma, tuberculosis, and fungal disease. Although the period between an apparently normal chest radiograph after chest drain removal and the presence of the lesion 3 weeks later made malignancy an unlikely diagnosis, histologic diagnosis was essential. In this case, needle biopsy was unsuccessful and an open thoracotomy was performed. An alternative approach used in many centers would have been a thoracoscopic excision, which might have resulted in a shorter hospitalization. The precise etiology of the cystic lesion in this case is unknown. We speculate that hemorrhage and introduction of a small amount of air occurred on removal of the chest drain. The local collection of blood and air, combined with later organization of the blood clot, resulted in the formation of a cystic lesion. The reported incidence of hemorrhage occurring as a complication of the clinical use of heparin varies between 1% to 32%.3Mant MJ O'Brien BD Thong KL Hammong GW Birtwhistle RV Grace MG Haemorrhagic complications of heparin therapy.Lancet. 1977; 1: 1133-1135Abstract PubMed Scopus (200) Google Scholar, 4Salzman EW Deykin D Shapiro RM Rosenberg R Management of heparin therapy, controlled prospective trial.N Engl J Med. 1975; 292: 1047-1050Crossref Scopus (356) Google Scholar Spontaneous hemorrhage at a number of sites, including intrathoracic hemorrhage, has been reported,5Holm HA Abilgaard U Kalvenes S Heparin assays and bleeding complications in treatment of deep vein thrombosis with particular reference to retroperitoneal bleeding.Thromb Haemost. 1985; 53: 278-281PubMed Google Scholar and this was a likely contributory factor in this case. Although the cystic lesion proved to be benign in this case, the normal features that aid differentiation of a “pseudotumor” from an actual tumor were absent. There was no pleural effusion elsewhere, the lesion was cystic, and there were no other medical conditions predisposing toward pleural fluid collection, such as cardiac failure or pleurisy. In such cases when intravenous heparin has been used, particularly in the presence of chest drains a heparin-associated intrathoracic pseudotumor should be considered as part of the differential diagnosis. Nevertheless, a histologic diagnosis is essential to exclude malignancy, and an open thoracotomy or thoracoscopic resection is necessary if less invasive means are unsuccessful." @default.
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• W2030478808 title "Heparin-associated intrathoracic pseudotumor" @default.
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• W2030478808 doi "https://doi.org/10.1016/s0022-5223(97)70301-5" @default.
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