Background: Spontaneous regression (SR) is a rare phenomenon in which a cancer disappears or remits without treatment. We report a case of breast cancer that showed spontaneous tumor regression in the surgical specimen after core needle biopsy.
Case Presentation: A 59-year-old woman came to our hospital complaining of a painful lump in the right breast.
Trichomonad is a type of flagellate that parasitizes the human oral cavity, intestine, or vagina. However, respiratory infection is rare. We report a patient with pyothorax related to Tetratrichomonas species, which is the first reported case in Japan.
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