他在体检时发现肺部有一个小肿瘤。

Tā zài tǐjiǎn shí fāxiàn fèibù yǒu yí gè xiǎo zhǒngliú.

During a physical exam, he found that there was a small tumor in his lung.

医生说这个肿瘤是良性的，不用太担心。

Yīshēng shuō zhège zhǒngliú shì liángxìng de, búyòng tài dānxīn.

The doctor said this tumor is benign, so there’s no need to worry too much.

如果肿瘤继续长大，就必须考虑手术切除。

Rúguǒ zhǒngliú jìxù zhǎngdà, jiù bìxū kǎolǜ shǒushù qiēchú.

If the tumor keeps growing, we must consider removing it with surgery.