Well, I am unable to find anything convincing for this.

Seems to involve a "tumour"

https://docs.google.com/viewer?a=v&q=cache:LuBk6ppts2EJ:www....

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Note added at 1 hr (2013-03-19 23:04:02 GMT)
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dose chemotherapy - Thorax
thorax.bmj.com/content/42/4/315.full.pdf
by TJ Littlewood - 1987 - Cited by 3 - Related articles
chemotherapy the median survival is 14 months for patients with limited disease (tumour confined to one hemithorax and ipsilateral supraclavicular lymph .

the first site in Portuguese mentions the use of chemotherapy in treating a " lesão tumescente "
so I think they are talking about a tumour in this instance

as you wouldn't use chemo for just a swelling...

see
dose chemotherapy - Thorax
thorax.bmj.com/content/42/4/315.full.pdf
by TJ Littlewood - 1987 - Cited by 3 - Related articles
chemotherapy the median survival is 14 months for patients with limited disease (tumour confined to one hemithorax and ipsilateral supraclavicular lymph .

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Note added at 1 hr (2013-03-19 23:07:31 GMT)
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http://irapilgrim.mcn.org/toc02.html

The word tumor is --or was-- a Latin word meaning swollen or enlarged. People used to talk about the tumor of pregnancy, or the tumor of infection or inflammation. The word tumor has been converted to a noun meaning an abnormal growth, and all other uses are obsolete. We now refer to the "enlargement of pregnancy" ("greatness" was a good word, but it isn't used much any more); the "swelling of inflammation;" Even the tumor of the passionate penis has been bowdlerized to "tumescent." Tumor is still occasionally used to refer to pregnancy, but only in unmarried ladies who go to out-of-town hospitals to have their "tumors" removed.