An endoscope for insertion into an anatomical space of a subject, comprising: a handle comprising (i) a liquid reservoir, and (ii) a liquid injection system comprising a pump, both housed entirely in said handle; a cannula attached at its proximal end to said handle, said cannula having at least one opening through which liquid from said reservoir can be ejected; and an imaging head attached to the distal end of said cannula, said imaging head comprising: a transparent tubular shaped body having (i) an essentially closed proximal end, and (ii) a tubular wall extending from said essentially closed proximal end and terminating at a distal open end of said tubular shaped body; at least one light source associated with said essentially closed proximal end such that its illumination is directed into said tubular wall, said at least one light source being disposed radially inwards of the outer dimensions of said tubular shaped body; a two dimensional detector array disposed inwardly of the inner surface of said tubular wall and distal to said at least one light source; and an imaging lens assembly held by direct contact with said transparent tubular shaped body and positioned distally to said detector array, such that it images onto said detector array, light reflected back into said imaging head, wherein said imaging head has a structure such that said illumination directed into said tubular wall is emitted partially distally and partially radially from said tubular wall into said anatomical space. a handle comprising (i) a liquid reservoir, and (ii) a liquid injection system comprising a pump, both housed entirely in said handle; a cannula attached at its proximal end to said handle, said cannula having at least one opening through which liquid from said reservoir can be ejected; and an imaging head attached to the distal end of said cannula, said imaging head comprising: a transparent tubular shaped body having (i) an essentially closed proximal end, and (ii) a tubular wall extending from said essentially closed proximal end and terminating at a distal open end of said tubular shaped body; at least one light source associated with said essentially closed proximal end such that its illumination is directed into said tubular wall, said at least one light source being disposed radially inwards of the outer dimensions of said tubular shaped body; a two dimensional detector array disposed inwardly of the inner surface of said tubular wall and distal to said at least one light source; and an imaging lens assembly held by direct contact with said transparent tubular shaped body and positioned distally to said detector array, such that it images onto said detector array, light reflected back into said imaging head, a transparent tubular shaped body having (i) an essentially closed proximal end, and (ii) a tubular wall extending from said essentially closed proximal end and terminating at a distal open end of said tubular shaped body; at least one light source associated with said essentially closed proximal end such that its illumination is directed into said tubular wall, said at least one light source being disposed radially inwards of the outer dimensions of said tubular shaped body; a two dimensional detector array disposed inwardly of the inner surface of said tubular wall and distal to said at least one light source; and an imaging lens assembly held by direct contact with said transparent tubular shaped body and positioned distally to said detector array, such that it images onto said detector array, light reflected back into said imaging head, wherein said imaging head has a structure such that said illumination directed into said tubular wall is emitted partially distally and partially radially from said tubular wall into said anatomical space.