Piece of pie sign (wrist)
The piece of pie sign refers to an abnormal triangular appearance of the lunate on an PA image of the wrist indicating lunate dislocation or perilunate dislocation 1-2. A lateral image will help differentiate whether there is lunate or perilunate dislocation with lunate dislocation demonstrating a spilled teacup sign.
- 1. Bridgeforth G, Cherf J. Lippincott's Primary Care Musculoskeletal Radiology. Lippincott Williams & Wilkins. (2010) ISBN:0781793777. Read it at Google Books - Find it at Amazon
- 2. Newberry JA, Garmel GM. Image diagnosis: perilunate and lunate dislocations. Perm J. 2012;16 (1): 70-1. - Free text at pubmed - Pubmed citation