Pulmonary epithelioid haemangioendothelioma is a rare vascular tumor of the lung with low malignant potential.
Rare tumour, with ~50 cases reported. Patient age at presentation ranges from 25-54 years old. Female predilection.
Often asymptomatic and discovered incidentally. Has been associated with chest tightness and shortness of breath.
Its exact aetiology is unclear. It may occur in male patients, which confuses the usual explanation of a role of estrogen in tumour formation.
Histology shows epithelioid or spindle-shaped cells with abundant eosinophilic cytoplasm. Lumina or vacuoles containing erythrocytes are present. Cells are arranged in nests and cords with degenerated interstitial mucoid.
Usually discovered incidentally.
- multiple nodules in the lungs or pleura
- bilateral, random distribution
- nodules usually 0.3-2.0 cm (although ~5 cm has been reported)
- calcifications are occasionally seen within the nodules
- if pleural invasion, then pleural thickening or effusion may occur
Treatment and prognosis
Prognosis is unpredictable due to variable oestrogen effects on the tumour. Life expectancy has ranged from 1-25 years, depending on presentation and possible resectability of the lesions. If the lesions are unresectable, then chemotherapy is usually used. Male gender, haemoptysis, asymmetric distribution, and pleural effusion are all associated with a worse prognosis.
History and etymology
Originally described in 1975 as an "intravascular sclerosing bronchioloalveolar tumour (IVBAT) of the lung".
The imaging differential is wide, including:
- 1. Shao J, Zhang J. Clinicopathological characteristics of pulmonary epithelioid hemangioendothelioma: A report of four cases and review of the literature. Oncol Lett. 2014;8 (6): 2517-2522. doi:10.3892/ol.2014.2566 - Free text at pubmed - Pubmed citation
- 2. Feng RE, Liu HR, Liu TH. Clinicopathologic and immunohistochemical study of pulmonary epithelioid hemangioendothelioma. Zhonghua Bing Li Xue Za Zhi. 2007;34 (1): 33-5. Pubmed citation