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Zymbal’s Gland, Duct - Cyst

Image of duct cyst in the Zymbal's gland from a female F344/N rat in a chronic study
Zymbal's gland, Duct - Cyst in a female F344/N rat from a chronic study. The Zymbal's gland duct is markedly distended (arrow).
Figure 1 of 4
Image of duct cyst in the Zymbal's gland from a female F344/N rat in a chronic study
Zymbal's gland, Duct - Cyst in a female F344/N rat from a chronic study (higher magnification of Figure 1). The Zymbal's gland duct cyst contains sloughed epithelial cells, necrotic debris, and keratin lamellae.
Figure 2 of 4
Image of duct cyst in the Zymbal's gland from a male B6C3F1 mouse in a chronic study
Zymbal's gland, Duct - Cyst in a male B6C3F1 mouse from a chronic study. The duct of the Zymbal's gland is markedly dilated (arrow).
Figure 3 of 4
Image of duct cyst in the Zymbal's gland from a male B6C3F1 mouse in a chronic study
Zymbal's gland, Duct - Cyst in a male B6C3F1 mouse from a chronic study (higher magnification of Figure 3). The Zymbal's gland duct cyst contains necrotic debris, sloughed epithelial cells, and keratin lamellae.
Figure 4 of 4
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comment:

Zymbal's gland duct cysts ( Figure 1image opens in a pop-up window , Figure 2image opens in a pop-up window , Figure 3image opens in a pop-up window , and Figure 4image opens in a pop-up window ) are prominently distensions of the Zymbal's gland duct that are lined by either attenuated squamous or glandular epithelium or by flattened stratified squamous epithelium. The former are typically filled with sebum, while the latter typically contain sloughed keratin lamellae. Zymbal's gland cysts are uncommon, but this may reflect the fact that this tissue is not usually sampled in routine toxicity studies.

recommendation:

Zymbal's gland duct cysts should be diagnosed whenever present but should not be graded.

references:

Copeland-Haines D, Eustis SL. 1990. Specialized sebaceous glands. In: Pathology of the Fischer Rat: Reference and Atlas (Boorman GA, Eustis SL, Elwell MR, Montgomery CA, MacKenzie WF, eds). Academic Press, San Diego, CA, 279-294.
Abstract: http://www.ncbi.nlm.nih.gov/nlmcatalog/9002563

National Toxicology Program. 1990. NTP TR-372. Toxicology and Carcinogenesis Studies of 3,3'-Dimethoxybenzidine Dihydrochloride (CAS No. 20325-40-0) in F344/N Rats (Drinking Water Studies). NTP, Research Triangle Park, NC.
Abstract: http://ntp.niehs.nih.gov/go/8884

National Toxicology Program. 2011. NTP TR-536. Toxicology and Carcinogenesis Studies of bis(2-Chloroethoxy)methane (CAS No. 111-91-1) in F344/N Rats and B6C3F1 Mice (Dermal Studies). NTP, Research Triangle Park, NC.
Abstract: http://ntp.niehs.nih.gov/go/34791

Seely JC, Boorman GA. 1999. Mammary gland and specialized sebaceous glands. In: Pathology of the Mouse: Reference and Atlas (Maronpot RR, Boorman GA, Gaul BW, eds). Cache River Press, Vienna, IL, 613-635.
Abstract: http://www.cacheriverpress.com/books/pathmouse.htm