Yes, VOLVULUSES is a Scrabble word!

Letter values in Scrabble US: V 4, O 1, L 1, V 4, U 1, L 1, U 1, S 1, E 1, S 1.

Is it a valid word?

VOLVULUSES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

abnormal twisting of the intestines (usually in the area of the ileum or sigmoid colon) resulting in intestinal obstruction