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NASIR HANEEF

· started a discussion

· 1 Months ago

Sir answer should be " Warthin's Tumour "

Question:
The picture given below shows the scintigraphy scan image of the right parotid gland. 99mTcO4− is intravenously administered and a dynamic scan (anteroposterior view) is performed which shows uptake of the radionuclide by the gland [Fig A]. Citric acid is instilled into the oral cavity 20 minutes after the intravenous injection to stimulate the secretion of saliva and a scan is performed which shows incomplete washout of the radionuclide from the gland [Fig B]. Based on the findings, which of the following can be excluded from the differential diagnosis?


Options:
A) Pleomorphic adenoma
B) Oncocytoma
C) Warthin’s tumour
D) Salivary stasis
Solution:
Warthin’s tumors and oncocytomas are derived from the epithelial cells of excretory ducts and do not communicate via excretory ducts. Thus, 99mTcO4− is taken up by the solid component of these tumors and is not eliminated after the stimulation of saliva secretion. Whereas, 99mTcO4− is not taken up by pleomorphic adenomas at all.

Ace Admin

· commented

· 21 Days ago

question is all except.. soclear answer is PA as it will not take up radiotracer