Clinicopathological variables Case 1 Case 2 Case 3 Case 4
Stage IIA2 IB2 IB1 IB1
Pathological finding papillary tubulocystic tubulocystic tubulocystic
Cytological finding* in Papanicolaou-stained smear        
Eosinophilic conspicuous nucleolus + + + +
Fine granular chromatin + + + +
Round/oval nucleus + + + +
Naked nucleus-like cell + + + +
Abundant translucent cytoplasm + + + +
Sheet-like arrangement + + + +
Hobnail/peg-shaped appearance + + + -
Basement membrane-like substance + + + -
Mirror ball cluster - - - +
* +: positive; -: negative
Table 1: Cytological features of the 4 cases.