**Category:** Geometry  
**Subtype:** Solid Geometry (specifically, Tetrahedrons)  
**Problem Description:** Calculate the volume \(V\) of the tetrahedron \(MNPQ\), where points \(M\) and \(N\) are midpoints of segments in a right isosceles triangle \(ABC\), and points \(P\) and \(Q\) are located on the edges of a pyramid \(SABC\) with given distances from the apex \(S\).