Usage Note
Geschwulst is a somewhat older but still current term for any abnormal growth or tumour, benign or malignant. Gutartige Geschwulst is a benign tumour; bösartige Geschwulst is malignant. More formal than Tumor in everyday speech.
Examples
"Die Röntgenaufnahme zeigte eine kleine Geschwulst im Lungengewebe."
Natural Translation
The X-ray showed a small tumour in the lung tissue.
Literal Translation
The X-ray image showed a small growth in the lung tissue.

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