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Updated: Jan 19, 2026

Author Spotlight: Refining Xenopus laevis Marking Techniques for Biomedical Studies
Published on: June 28, 2024
Colon Tumor Tattooing-Derived Ink-Laden Macrophages in Peritoneal Ascitic Fluid
Álvaro López-Janeiro1, Luis Blasco2, Ana Margarita Rodriguez2
1Department of Pathology, University Hospital La Paz, Madrid, Spain, alvarolopezjaneiro@gmail.com.
Introduction:
Macrophages containing exogenous pigments are commonly encountered in cytological specimens.
Case Presentation:
We present a case of tumor tattooing as an infrequent exogenous source of peritoneal fluid macrophagic pigment in a 76-year-old female.
Discussion And Conclusion:
Tattooing-derived ink can be a source of macrophagic pigment and should not be confused with other endogenous or exogenous pigments. The anatomical location and past medical history of the patient can aid in the diagnosis.
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