Items tagged “rare”

Primary melanoma of the prostate is rare, and usually cannot be diagnosed on imaging alone. In many cases, it is believed that in fact, the tumor represents prostatic involvement by melanoma of the urethra. Epidemiology Primary malignant melanoma of the prostate represents both a tiny fraction...

Melanoma of the urethra is a very rare tumor of the male urethra and often presents as an invasive prostatic mass. As such it is usually referred to as primary prostatic malignant melanoma.

Prostate sarcomas are an uncommon and heterogeneous group of tumors arising from mesenchymal cells in and around the prostate (as opposed to the more common prostate adenocarcinoma which derives from the glandular tissue).  Pathology In children, the most common tumor type is a prostatic rhabd...

Ossifying renal tumor of infancy (ORTI) is a rare renal tumor. Epidemiology extremely rare, <<1% of pediatric renal neoplasms (17 cases reported) 6 days - 3 months male predominant Pathology Histology reveals spindle cells and osteoblastic cells in a calcified osteoid matrix. It is thought...

Secretan disease refers to rare situation of post-traumatic firm edema of the dorsum of the hand. The diagnosis can be considered in the setting of remote trauma and a fibrotic plaque-like lesion involving both the subcutaneous and tendinous spaces. Radiographic features MRI Signal characteri...