Ungual Keratoacanthoma With Features of Regression.

ABSTRACT: Ungual keratoacanthoma (UKA) is an infrequent tumor. Different from keratoacanthoma in other parts of the skin, UKA rarely regresses, and grows aggressively with common destruction of the subjacent phalanx. Reported cases of UKA with features of regression are exceptional, and even dermatopathologists with reputed experience in nail pathology admit to having seen very few cases. We herein report a case of a 77-year-old man who presented a painful subungual lesion on the second finger of the right hand. An x-ray showed evidence of erosion of the subjacent distal phalanx. The patient was highly concerned about the lesion and rejected conservative treatment preferring amputation of the distal phalanx. The histopathologic examination revealed a UKA with features of regression.

Particulate wear debris osteolysis, acute urinary retention and delirium as late complications of hip arthroplasty.

Intrapelvic mass formation as a result of particulate wear debris induced osteolysis is a recognised late complication of cementless total hip arthroplasty. Clinical presentation typically involves hip and/or leg pain resulting in functional impairment, and obstructive urinary symptoms developing 3-20 years after surgery. An acute confusional state has never been described in this scenario. We report the case of an 86-year-old gentleman with a diagnosis of dementia brought to our emergency department with an acute confusional state. Abdominal imaging revealed a distended bladder, a large pelvic mass and a lytic lesion within his right acetabulum. Cytological and microbiological examination of fluid obtained with radiologically guided aspiration of the mass was negative for neoplasia and infection.