SELECT COUNT(*) INTO @node_level
FROM {terms} AS t1
INNER JOIN {terms} AS t2
ON t1.mptt_left BETWEEN t2.mptt_left AND t2.mptt_right;
WHERE t1.term = @myterm;

SELECT term.term, term.mptt_left, term.mptt_right
FROM {terms} AS term
INNER JOIN {terms} AS t2
	ON term.mptt_left BETWEEN t2.mptt_left AND t2.mptt_right
INNER JOIN (
SELECT term, COUNT(*) as level
FROM {terms} AS t1
INNER JOIN {terms} AS t2
ON t1.mptt_left BETWEEN t2.mptt_left AND t2.mptt_right
GROUP BY term
) as levels
ON term.term = levels.term
AND levels.level = (@node_level + 1)
GROUP BY term.term;