A dog was discovered hiding in a fibroadenoma excised from the right breast of a 30-year-old woman. The dog is small (<0.1 cm), with a hematoxylin-eosin color coat, erect ears, and bushy tail. We are unsure if the dog has been spayed or neutered, but it is definitely fixed (play on the word "fix": fresh tissue of a surgical specimen must be "fixed" (usually overnight) in formalin before proceeding to paraffin embedding of the tissue and preparation of the glass microscope slide).
Thanks to Dr. Catroppo for sending this!
Credit: Weinrach DM and Laskin WB. Lost dog. Arch Pathol Lab Med 2003; 127(11): 1531