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The possible association of the supernova remnant (SNR) G 343.1-2.3 with thepulsar PSR B 1706-44 (superposed on the arclike "shell" of the SNR) has beenquestioned by some authors on the basis of an inconsistency between the impliedand measured (scintillation) transverse velocities of the pulsar, the absenceof any apparent interaction between the pulsar and the SNR's "shell", and someother indirect arguments. We suggest, however, that this association could bereal if both objects are the remnants of a supernova (SN) which exploded withina mushroom-like cavity (created by the SN progenitor wind breaking out of theparent molecular cloud). This suggestion implies that the actual shape of theSNR's shell is similar to that of the well-known SNR VRO 42.05.01 and that theobserved bright arc corresponds to the "half" of the SNR located inside thecloud. We report the discovery in archival radio data of an extended raggedradio arc to the southeast of the bright arc which we interpret as the "half"of the SN blast wave expanding in the intercloud medium.Comment: 7 pages, including 2 figures, uses aa.cls v5.1; A&A in pres

PSR B 1706-44 and the SNR G 343.1-2.3 as the remnants of a cavity supernova explosion