CASE HISTORY – September 2016

Pneumocytoma – a rare cause of a solitary pulmonary nodule

Authors: Eva-Maria Kikkas, Hannes Tamm, Tanel Laisaar

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A solitary pulmonary nodule is a round lesion in the lung parenchyma. It is commonly asymptomatic and found on a routine chest radiograph or a CT-scan. As radiological investigations are not 100% accurate in differentiating between benign and malignant tumour, morphological study is needed to confirm the diagnosis and to plan further patient management, especially in patients with previous malignant disease. Video-assisted thoracoscopic lung resection is nowadays widely used minimally invasive method to take a lung biopsy or completely remove solitary pulmonary nodule.

Pneumocytoma is a rare cause of solitary pulmonary nodule. It occurs more often in middle aged women and is asymptomatic in majority of cases.It is a benign lung tumour consisting of four major histological patterns and it develops from type II pneumocytes. Due to pneumocytoma’s variable histological structure it is especially difficult to differentiate from other more common lung nodules. Diagnosis is usually confirmed with morphological study of the removed nodule.