What is your diagnosis?
The photomicrograph shows beaded, lightly pigmented casts within tubules that are consistent with myoglobin casts and below, an immunoperoxidase stain for myoglobin confirms this diagnosis. Of note, myoglobin casts and hemoglobin casts cannot always be distinguished from each other by morphology alone. And, in most cases, immunoperoxidase staining for hemoglobin and myoglobin can easily facilitate differentiation.
Quick note: This post is to be used for informational purposes only and does not constitute medical or health advice. Each person should consult their own doctor with respect to matters referenced. Arkana Laboratories assumes no liability for actions taken in reliance upon the information contained herein.