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1·The dense white encircling tumor mass is arising from the visceral pleura and is a mesothelioma.

图示间皮瘤，致密的白色环状肿块从胸膜脏层长出。

2·It directly covers the lung itself, which makes extraction of the visceral pleura without subsequent damage to the lung very difficult.

它直接覆盖于肺表面，使得移除脏层胸膜而无肺损伤非常困难。

3·The ease of which it can be removed is dependant on which of the pleural surfaces becomes malignant: the parietal pleura or the visceral pleura.

解除那部分决定于病变部位：脏层胸膜还是壁层胸膜。