Bonjour je vien de trouver un probleme il n'affiche pas de ligne

Bonjour,

voici mon code:
<?php
$cin="";
$cin=$_GET['cin'];



$result=$mysqli->query("SELECT * FROM affection_cancereuse where cin ='$cin' " )or die($mysqli->error);
if(mysqli_num_rows($result)!=0){
$row=$result->fetch_array();
?>

<?php

$row = $result->fetch_assoc() ?>

<?php

while($row = $result->fetch_assoc()): ?>
<thead> <tr >

<td><?php echo $row['motif_consultation']; ?></td>
<td><?php echo $row['date_consultation']; ?></td>
<td><?php echo $row['antecedents']; ?></td>
<td><?php echo $row['examen_clinique']; ?></td>
<td><?php echo $row['bilan_paraclinique']; ?></td>
<td><?php echo $row['diagnostique']; ?></td>
<td><?php echo $row['reference']; ?></td>
<td><?php echo $row['devenir']; ?></td>



</tr>
</thead>
<?php endwhile;


?>