thoracoparacephalus

Unequal conjoined twins in which a rudimentary parasitic head is attached to the thorax of the autosite. See conjoined twins, under twin. [thoraco- + G. para, beside, + kephale, head]

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tho·ra·co·para·ceph·a·lus (thor″ə-ko-par″ə-sefґə-ləs) [thoraco- + para- + -cephalus] asymmetrical conjoined twins, a parasitic twin with rudimentary head being attached to the thorax of the larger twin.