Parathyroid cyst: A problem in differential diagnosis

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Up of cOhgeIlOU8, iihl!oW CO11 Xicroscopic (Tigs. 1 to 4) : The Cyst wall was IIliillC rwtivo tissue lined in a few areas by a clcgeuerating, flattcncttl upit.helium. Within the cyst wall were two types of cpitllelial cell clusters. One was :I Ii& Itasophilic ccl1 with a distinct IIUC~CUS and small amounts of cytoplasm--the parathyroid chief cell. The other was a larger, 01’ qvtrq,l;lsnl pale f:osinophiliv wll with a small, #lark-staining IIIIC~CII~:III~I :I ~w:lt~‘r :1rno1111t the oxyphil wll.

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Although the paratlU:roid cyst is rare (some twenty-odd previously rcportcd should be considered in the differential diagnosis of cervical swellings. Because this cyst is usually situated iu the posit.ion of one of the lower parathyroid glands, it is often mista.ken for a thyroid adcno111a.” If there arc symptoms of a unilateral vocal cord paralysis, it may be mistaken for a thyroid carcinoma.“~G On surgical intervention, however, a tr;ux4nwnf, thin-walled cyst CUYCS), it