Needle-shaped crystals negatively birefringent on polarized microscopy is characteristic of which crystal associated ahropathy?: (A) Gout, (B) CPPD, (C) Neuropathic ahropahty, (D) Hemophilic ahropathy
Answer is A. Crystal of pseudogout:Made up of calcium pyrophosphateWeakly positive birefringent, rhomboidCrystal of goutMade up of uric acid (monosodium urate)(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 433, 434)