Primary thyroid lymphoma associated with metastatic thyroid tumor: discrimination with US.
We surgically treated a 75-year-old man who suffered from metastatic adenocarcinoma from the colon associated with primary thyroid lymphoma measuring 1 cm maximum in diameter. Radiologic findings were correlated with histopathology of excised specimens. Ultrasonography could discriminate between these two tumors based on the margin characteristics and the lesion echogenicity: the metastatic tumor was shown as an ill-defined hypo to iso echoic mass, while the malignant lymphoma was detected as a well-defined markedly hypoechoic mass. In addition, we could confirm that early-stage primary thyroid lymphoma even as small as 1 cm shows the same radiologic appearance as that of a bulky lymphoma.
Horii
A
A
Department of Otolaryngology, Osaka Teishin Hospital, Osaka 543, Japan.
Takashima
S
S
Yoshida
J
J
Honjo
Y
Y
Mitani
K
K
Kubo
T
T
D000230:Adenocarcinoma / Q000000981:diagnostic imaging / Q000469:parasitology / Q000556:secondary*; D000368:Aged; D003110:Colonic Neoplasms / Q000473:pathology; D006801:Humans; D008223:Lymphoma / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D009378:Neoplasms, Multiple Primary / Q000000981:diagnostic imaging / Q000473:pathology; D013961:Thyroid Gland / Q000473:pathology; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging* / Q000469:parasitology / Q000556:secondary*; D014463:Ultrasonography