Tyrosine crystalluria

Tyrosine crystals appear as fine, high refractive colourless or yellow needles which agglomerate to bundles or heaps (Fig. 42). Their appearance were described in humans related to a heavy  liver disease but haven’t been often detected in dogs and cats related to liver diseases.

Fig. 42)

Microphotographic picture from needle-like shaped crystals in the urine sediment from a dog. Needle-like shaped crystals may consist of tyrosine, calcium sulfate, sodium urate, ampicillin and triiodized roentgen contrast agent.