On [**2781-9-17**], a lumbar puncture was performed which was negative for malignant cells.
 Patient has had a procedure
(ROOT (FRAG (SBAR (IN On) (SINV (-LRB- -LSB-) (NP (NP (SYM **) (CD 2781-9-17) (X (SYM **)) (-RRB- -RSB-)) (, ,) (S (NP (DT a) (JJ lumbar) (NN puncture)) (VP (VBD was) (VP (VBN performed) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (ADJP (JJ negative) (PP (IN for) (NP (JJ malignant) (NNS cells))))))))))))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (VP (VBN had) (NP (DT a) (NN procedure))))))
( ( On ( -LSB- ( ( ( ** ( ( 2781-9-17 ** ) -RSB- ) ) , ) ( ( a ( lumbar puncture ) ) ( was ( performed ( which ( was ( negative ( for ( malignant cells ) ) ) ) ) ) ) ) ) ) ) . )
( Patient ( has ( had ( a procedure ) ) ) )