Tag Puay Hoon Tan MD FRCPA

Idiopathic scrotal calcinosis

Definition Calcification of dermal connective tissue of the scrotal skin Clinical features Epidemiology Usually occurs in young men, with children and older men reportedly also being affected. You’re Reading a Preview Become a Clinical Tree membership for Full access and…

Viral orchitis

Definition Viral infection of the testis, most frequently due to mumps virus and Coxsackie B virus. The other viruses that can infect the testis and cause acute orchitis are influenza, infectious mononucleosis, coronavirus, varicella, and others. Clinical features Epidemiology In…

Testiculosplenic fusion

Definition A benign congenital condition that is a form of splenogonadal fusion involving the spleen and testis Clinical features Epidemiology Rare developmental condition You’re Reading a Preview Become a Clinical Tree membership for Full access and enjoy Unlimited articles Become…

Rhabdoid tumor of the kidney

Definition Highly aggressive malignant tumor composed of cells with rhabdoid morphology in pediatric patients Clinical features Epidemiology Affects young children, with mean age at diagnosis 1 year; the majority diagnosed before 2 years of age; extremely uncommon beyond 3 years…

Renal medullary carcinoma

Definition Highly aggressive type of renal cell carcinoma centered in the medulla, associated with the sickle cell trait and hemoglobinopathies Clinical features Epidemiology Affects young adults in their second to third decades of life, with male-to-female ratio of 2:1 Most…

Renal dysplasia

Definition A congenital developmental renal malformation resulting from abnormal nephrogenesis related to the inability of the ureteric bud to communicate with the metanephric blastema Clinical features Epidemiology Relatively common, affecting 1 in 1000 of the general population. About 10% of…

Urothelial carcinoma, microcystic variant

Definition A histologic variant of urothelial carcinoma that is composed of malignant urothelial nests, usually with low-to-intermediate nuclear grade, with microcyst, macrocyst and tubular formation. Usually occurs in the bladder with rare cases in the renal pelvis Clinical features Epidemiology…

Endometriosis of the bladder

Definition Ectopic endometrial tissue consisting of endometrial-type glands, with or without accompanying endometrial stroma, within the bladder wall Clinical features Epidemiology Constitutes 1%–2% of endometriotic lesions in women Affects adult women in the reproductive age group, often with a history…

Basal cell carcinoma of the prostate

Definition Basaloid carcinoma in the prostate, composed of malignant prostatic basal cells Includes tumors with adenoid cystic-like histological appearances Clinical features Epidemiology Affects adult men in the 6th decade of life You’re Reading a Preview Become a Clinical Tree membership…

Prostatic basal cell adenoma

Definition Uncommon benign lesion of the prostate composed of a nodular proliferation of basaloid nests or benign glands with prominent basal cells that may obscure the glands. Basal cell hyperplasia extensively involving an adenomatous nodule may be interpreted as basal…