]> 2026-07-31T11:50:53+00:00 WBR0901 0 en Eosinophilic Eosinophilic crystals are characteristics of gout and not pseudogout. Weak positive birefringence In pseudogout, rhomboidal crystals exhibit weakly positive birefringence under polarized light. Yellow when parallel to light Crystals that are yellow when parallel to light are characteristic of gout and not pseudogout. Blue when perpendicular to light Crystals that are blue when perpendicular to light are characteristic of gout and not pseudogout. Hexagonal shape In pseudogout, crystals have a rhomboid shape and not a hexagonal shape. Pathophysiology A 62-year-old woman known to have osteoarthritis is hospitalized for pneumonia for which she receives an intravenous course of antibiotics. On her third day of hospitalization, she reports improvement in her respiratory status but complains of a new onset of knee pain that started in the morning and progressively worsened throughout the day. The knee is red, swollen and tender upon palpation. Her temperature is 37 °C (98.6 °F), blood pressure is 120/70 mmHg and heart rate of 70/min. Analysis of the synovial fluid reveals deposition of rhomboid crystals. Which other features characterizes the crystals deposited in this patient’s joint? B Musculoskeletal/Rheumatology 2020-10-28T02:02:02Z 2459150.5847454 WBR0901