Characterization of Black Pigmenturia in a Cat with Apocrine Gland Cystadenocarcinoma

Quentin Fournier, A. Hohn, S. Deubel, Elspeth Milne, Spela Bavcar, Linda Morrison

Research output: Contribution to journalArticlepeer-review


An 8-year-old neutered female domestic shorthair cat was presented for further management of an apocrine gland cystadenocarcinoma. Extensive nodal metastasis was diagnosed and the cat was humanely destroyed 2 months after presentation. Post-mortem histopathology of the cystadenocarcinoma revealed areas of yellow–brown granular pigmentation on light microscopy, staining positively for reducing substances with Schmorl’s stain and demonstrating autofluorescence on confocal microscopy. The cat’s urine was black and also exhibited autofluorescence and further analysis revealed increased free pentosidine. Based on these findings, it was presumed that the apocrine gland cystadenocarcinoma was producing lipofuscin-like pigments, and that the characteristics of the urine were
Original languageEnglish
JournalJournal of Comparative Pathology
Publication statusPublished - 8 Apr 2020


  • cat
  • pigmenturia
  • apocrine gland
  • cystadenocarcinoma
  • advanced glycation endproduct


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