SACRAL BONE METASTASES AS A PRESENTATION OF PAPILLARY THYROID MICROCARCINOMA: A RARE CASE REPORT

Abstract

Thyroid carcinoma usually   presents as a diffuse or nodular neck lump and it comprises 1% of all  malignancies .  Distant metastasis in Papillary carcinoma is uncommon like follicular  thyroid  carcinoma .We  present  a  case  of  papillary  thyroid  microcarcinoma  presenting  as  a  pelvic  bone  metastasis. A  65-year  old  female  was  found  on  computerized  tomography  to  have  an   finding  of  6cm  soft  tissue  mass  in  the  left  side  of  sacrum  bone.  Biopsy  from the  lesion  confirmed  metastatic  follicular  variant  thyroid  carcinoma.  Head  and  neck  examination  was  normal and there  was  no  history  of  a  neck  swelling.  Further  imaging  confirmed  nodule  in  the  left  lower  lobe  of  thyroid  measuring  1x0.8cm.  Ultrasound  guided  fine  needle  aspiration  from  thyroid  nodule  confirmed  papillary  carcinoma  thyroid.  And immunohistochemistry  done  on  biopsy  confirmed  metastatic  papillary  carcinoma  thyroid.  The  Papillary  microcarcinoma is usually non-invasive. But this case report emphasised clinically significant bone  metastasis can arise  from papillary microcarcinoma (PMC ).