coffin lid crystals
Definition A descriptive term for 3-6-sided colourless prism-shaped crystals seen in various biological fluids which have been fancifully likened to the lids on coffins.
• Urine Ammonium magnesium phosphate–triple phosphate (struvite) crystals, are typically seen in neutral or
alkaline urine, and linked to urinary tract infections of urea-splitting bacteria (image to the left).
• Synovial fluid Coffin lid crystals may be seen in a background of , hyperparathyroidism, haemochromatosis, hypomagnesaemia, hypophosphatasia, myxedema, ochronosis, and Wilson’s disease
Differential diagnosis Other conditions affecting joints–e.g., gout, osteoarthritis, rheumatoid arthritis, chondrocalcinosis[/fusion_builder_column][/fusion_builder_row][/fusion_builder_container]