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Although common in adults simple cortical renal cysts are rare in children. Caliceal diverticula are rare in adults and children. A case of a caliceal diverticulum apparently sealing off and becoming an isolated simple cyst in the renal parenchyma has been reported as an unusual complication of caliceal diverticula. There have been 2 other cases of caliceal diverticula becoming sealed off reported in the literature, although neither progressed to frank cysts. We report 2 cases of definite caliceal diverticula progressing to simple renal cortical cysts.

Whereas the outlines of nephrons and collecting ducts in kidneys from subjects less than 20 years old age regular, the number of diverticula on the distal tubule in kidneys from adults increase with age. An embryogenic progression from diverticula to microscopic and macroscopic cysts to radiologically detectable cysts can be established from morphological anomalies found in kidneys from adults. Therefore, a diverticulum on distal and collecting tubules and collecting tubules is postulated as the precursor of a simple cyst.

We report 5 cases of simple cyst of the testis, the largest series to date, and review the literature. Included are 2 autopsy cases, a case of a multilocular simple cyst and 1 case treated nonoperatively. Based on our experience, simple cyst of the testis should be suspected particularly in an enlarged but otherwise palpably normal testis. High resolution real-time scrotal sonography revealing an anechoic mass in the testis with well defined walls, and enhanced posterior through transmission and edge shadowing is diagnostic for a simple cyst. An asymptomatic simple cyst of the testis may be treated with observation alone. The symptomatic simple cyst should be treated ideally with local parenchyma-sparing excision.

While fluid collections within the scrotum are not uncommon, an uncomplicated cyst attached to or within the various components of the scrotum is unusual. We report a case of a rare simple cyst of the testicle, which was diagnosed accurately by preoperative ultrasound examination.

A 17-year-old girl was hospitalized for evaluation of gradually decreasing function of a kidney transplanted 8 years earlier. A plain film of the abdomen showed a possible renal calculus. Excretory urography proved that this calcification was slightly anterior to the kidney but in the upper pole a well rounded mass was discovered. An echogram confirmed the diagnosis of benign renal cyst.Malignant cystic lesions obviously must be differentiated from those that are benign. Patients on immunosuppressive therapy are known to have a higher incidence of malignancy than the general population. A malignant tumor may require withdrawal of immunosuppressive therapy and removal of the transplanted organ, whereas a benign cyst would require no therapy unless it becomes infected or produces obstruction.