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Within the text we describe a 66-year-old male with a history of prostate cancer (PCa), incidentally found to have left-sided hydronephrosis and a left ureteral lesion. Ureteroscopy was employed to visualize the lesion, a biopsy was taken, and a double J stent was placed. The lesion was of prostatic origin and the patient was subsequently started on androgen deprivation therapy (ADT). 6 months following the procedure, the patient's PSA had decreased and his hydronephrosis had resolved. We are the first to report treating a ureteral metastasis from PCa and its associated hydronephrosis solely with ADT and double J stenting, respectively.

Thyroid-like follicular carcinoma of the kidney (TLFCK) is a rare but emerging renal neoplasm that morphologically mimics follicular carcinoma of the thyroid but lacks immunohistochemical expression of thyroid markers such as TTF-1 and thyroglobulin. Here, a case of an incidentally discovered TLFCK in a 27-year-old man is reported. Histologic evaluation demonstrated an encapsulated proliferation of variably sized thyroid follicle-like epithelial-lined spaces filled with colloid-like eosinophilic secretions. Immunohistochemical analysis confirmed lack of expression of the thyroid markers TTF-1 and thyroglobulin with expression of PAX8 and CD10, confirming a neoplasm of renal origin, which correlated to the clinical and radiographic absence of thyroid pathology. In this report, this case is described with an emphasis on the differential diagnosis.