Kjossev and Losanoff described the TN(R)C classification for hydatid cysts in the liver. The authors are from the Military Medical Academy of Sofia in Bulgaria and the University of Chicago.
Parameters:
(1) T code for topography in the liver
(2) N code for nature of the cyst
(3) R code if recurrent
(4) C code for complications
Code
Description
T1 to T8
number corresponds to Coinard's segments I to VIII
N1
simple cyst with no internal material except sand
N2
cyst with detached endocyst secondary to rupture
N3
cyst with daughter cysts and/or matrix
N4
densely calcified cyst
N5
residual cavity or hepatic lesion after surgery, including postoperative fistula
R
recurrent cyst
C0
uncomplicated
C1
adhesions of the cyst to adjacent structures like bowel
C2
compression of neighboring structures like the gallbladder
C3
communication between cyst and biliary tract
C4
infected, abscess
C5
communicating rupture of the cyst
C6
direct rupture of the cyst
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