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Nuptial pad amputation in an american bullfrog (lithobates catesbeianus) with squamous cell carcinoma

Latney, La'Toya V., Miller, Erica, Pessier, Allan P.
Journal of zoo and wildlife medicine 2015 v.46 no.4 pp. 941-944
Lithobates catesbeianus, amphibians, amputation, biopsy, carpus, fungi, histopathology, males, neoplasm cells, resection, squamous cell carcinoma
A 7-yr-old male captive American bullfrog (Lithobates catesbeianus) presented with a 2-wk history of an enlarged, ulcerated nuptial pad on the mediopalmar surface of the first digit of the left carpus. A 3-mm wedge biopsy of the mass was not diagnostic and differentials included an epidermal inclusion cyst or squamous cell carcinoma. No fungal or acid-fast organisms were cultured or noted on impression smear. Wide surgical resection of the mass and associated first digit were performed. Histopathology confirmed squamous cell carcinoma associated with the dermal nuptial gland with neoplastic cells extending close to deep surgical margins. Two months after surgery, no recurrence was noted. Although experimental tumor studies in amphibians are well documented, clinical reports of cutaneous neoplasia management in captive amphibians are scarce. Squamous cell carcinoma should be considered as a differential diagnosis when male anurans present with nuptial gland enlargement.