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//0x58 bytes (sizeof)
struct _SEGMENT
{
    struct _CONTROL_AREA* ControlArea;                                      //0x0
    ULONG TotalNumberOfPtes;                                                //0x8
    ULONG NonExtendedPtes;                                                  //0xc
    ULONGLONG NumberOfCommittedPages;                                       //0x10
    ULONGLONG SizeOfSegment;                                                //0x18
    union
    {
        struct _MMEXTEND_INFO* ExtendInfo;                                  //0x20
        VOID* BasedAddress;                                                 //0x20
    };
    struct _EX_PUSH_LOCK SegmentLock;                                       //0x28
    struct _SEGMENT_FLAGS SegmentFlags;                                     //0x30
    union
    {
        ULONGLONG ImageCommitment;                                          //0x38
        struct _EPROCESS* CreatingProcess;                                  //0x38
    } u1;                                                                   //0x38
    union
    {
        struct _MI_SECTION_IMAGE_INFORMATION* ImageInformation;             //0x40
        VOID* FirstMappedVa;                                                //0x40
    } u2;                                                                   //0x40
    struct _MMPTE* PrototypePte;                                            //0x48
    struct _MMPTE ThePtes[1];                                               //0x50
};