1. Butterfly rash: hallmark of lupus;Kumar;QJM,2019
2. The rheumatoid swan-neck deformity;Nalebuff;Hand Clin,1989
3. Lane R , Nallamothu SV. Swan-neck deformity. StatPearls [Internet]. Treasure Island: StatPearls Publishing; 2022. [Internet. Accessed February 2, 2023.] Available from: https://www.ncbi.nlm.nih.gov/books/NBK525970
4. The panda sign;Kurdziel;Radiology,2000
5. Pulmonary manifestations of sarcoidosis;Baughman;Presse Med,2012