What are Hematoidin crystals?
Hematoidin has a golden-brown crystalline pigmentation and is composed of thread-like filaments arranged in star-shaped clusters akin to a Medusa’s head. Hematoidin forms when erythrocyte extravasation occurs in a closed tissue compartment and is a result of hemoglobin metabolism under low oxygen tension conditions.
What causes Hematoidin crystals?
Special features: Hematin and hematoidin crystals both result from the breakdown of hemoglobin in tissue. Hematin is a porphyrin compound. Hematoidin is similar to bilirubin. The crystals may be found anywhere in the body approximately two weeks after bleeding/hemorrhage.