In this paper, we exclude the possibility of existence of a singular soluti
on of the selfsimilar type proposed by JEAN LERAY. More precisely, using a
slightly stronger hypothesis we give a simpler proof to the analogous resul
t established by J. NECAS, M. RUZICKA and V. SVERAK. We also discuss the po
ssible existence of a singular solution of pseudo-selfsimilar type.