Which one of the following choices is a likely cause for this condition in a cat?

Well played!  You chose C - Doxycycline, the correct answer!

This is an esophageal stricture secondary to doxycycline tablets that remained in the esophagus too long.

Administration of doxycycline tablets to cats should be in a slurry or followed by a bolus of food or water.

A better option is compounded doxycycline liquid to prevent the problem all together.

Plain radiographs were unremarkable. Fluoroscopy was performed using liquid barium.

There was a persistent narrowing in the cranial cervical esophagus which never dilated as the peristaltic bolus passed through it.

There was also slowing of the bolus passage at this site.

Spirocerca lupi is the esophageal worm of the dog.

It can cause the formation of a radiodense mass in the esophagus.

Ref: Plumb, Veterinary Drug Handbook 7th ed. pp 486-92. Images courtesy, Dr A Zwingenberger and Veterinary Radiology.

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