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. <EOS>