title: Subungual keratoacanthoma: ultrasound and magnetic resonance imaging findings.
abstract: Subungual keratoacanthoma is a rare, squamoproliferative neoplasm arising at the nail bed. It may cause erosion of the underlying bone. We report a case of subungual keratoacanthoma of the right thumb in a 63-year-old man. Radiographs showed cortical erosion of the distal phalanx of the right thumb. Ultrasonography showed a mixed echoic tumor. On magnetic resonance imaging (MRI), the tumor showed intermediate signal intensity on T1-weighted images and mixed intermediate and high signal intensity on T2-weighted images with peripheral thin rim enhancement.
authors: Department of Pathology, Yeungnam University College of Medicine, 317-1, Daemyung-Dong, Nam-Gu, Daegu City, 705-717, South Korea. joonhyukchoi@ynu.ac.kr
authors: Joon Hyuk
authors: JH
authors: Choi
authors: Dong Hoon
authors: DH
authors: Shin
authors: Duk Seop
authors: DS
authors: Shin
authors: Kil Ho
authors: KH
authors: Cho
mesh_terms: D003287:Contrast Media / Q000008:administration & dosage; D003920:Diabetes Mellitus; D003937:Diagnosis, Differential; D005500:Follow-Up Studies; D006801:Humans; D007089:Image Enhancement; D007636:Keratoacanthoma / Q000175:diagnosis* / Q000473:pathology; D008104:Liver Cirrhosis, Alcoholic / Q000150:complications; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009260:Nail Diseases / Q000175:diagnosis* / Q000473:pathology; D010146:Pain / Q000209:etiology; D035583:Rare Diseases; D013933:Thumb / Q000000981:diagnostic imaging* / Q000473:pathology*; D014463:Ultrasonography
chemical_list: D003287:Contrast Media