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Pulmonary mucinous cystic tumour of borderline malignancy: a rare variant of adenocarcinoma
  1. H Monaghan1,
  2. DM Salter1,
  3. T Ferguson2
  1. 1Department of Pathology, Edinburgh University Medical School, Teviot Place, Edinburgh EH8 9AG, UK;
  2. 2Department of Cardiothoracic Surgery, The Royal Infirmary of Edinburgh, Lauriston Place, Edinburgh EH3 9YW, UK

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    Pulmonary mucinous cystic tumours of low or borderline malignant potential (PMTBMs) are extremely rare. These tumours have a very good prognosis and as such should be distinguished from usual type pulmonary adenocarcinoma. Here, we describe a case of PMTBM that arose in a 48 year old male non-smoker. He presented to respiratory physicians with right lower lobe pneumonia that failed to improve with antibiotic treatment. Sputum cytology revealed adenocarcinoma cells but at bronchoscopy no endobronchial tumour was seen. A right lower lobectomy was performed. Macroscopically, the lobectomy specimen contained an ill defined cystic lesion containing mucin. This measured 15 × 8 × 10 cm.

    The tumour comprised tall columnar mucin secreting cells with minimal cytological atypia (fig 1) and no mitoses. The tumour cells …

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