A case is described of primary hyperparathyroidism in a patient with both a parathyroid cyst within the thymus gland and a concomitant parathyroid adenoma. The parathyroid adenoma contained microcystic areas of degeneration, and it is thought that the parathyroid cyst reflected degenerative change in a pre-existing adenoma. Parathyroid cyst should be considered in the differential diagnosis of ...

Epithelial abnormalities: Von Brunn’s nests Cystitis glandularis Cystitis cystica Squamous metaplasia Nephrogenic adenoma Papillary hyperplasia Non-specific cystitis Papillary-polypoid cystitis Specific cystitis Follicular cystitis Interstitial cystitis Eosinophilic cystitis Giant cell cystitis Radiation cystitis Incrusted cystitis Emphysematous cystitis Granulomatous cystitis Malakoplakia Poly...