In Medicine, SEMIOLOGY is the SCIENCE and art of detection and interpretation of SIGNS.
In Clinical Medicine most SIGNS are visual expressions of MORPHOGENESIS and its alterations or DYSMORPHOGENESIS. SYNDROME refers to a cluster of typical recurrent patterns of concurrent signs. Strictly speaking, SYN implies concurrent and DROMOS implies running, in this case, "SIGNS RUNNING TOGETHER". This brings us SIGN vs SIGNAL. Note that we mention SIGN not SIGNAL because it ir very rare that a SIGN alone is specific enough to be a SIGNAL of a SYNDROME, in other words, SIGNS are rarely pathognomonic. A question arises concerning SYMPTOMS, which generally are reported by the individual experiencing them and may be more or less objective, those that are can also be considered as SIGNS. In essence, therefore, SIGNS must be objective while SIGNALS are not, they are hypothetical. SIGNALS represent interpretation of SIGNS, and reflect diverse degrees of experience and intelligence of those who interpret the SIGNS.
SYNDROMES represent consistently observed combinations of SIGNS, for example a face. Fases that "talk to us" are called, in Medicine, FACIES. Neither SYNDROMES nor FACIES are synonyms of DIAGNOSIS. Nonetheless, SYNDROMES can be characteristic of particular mechanisms or PATHOGENESIS, causes or ETIOLOGY or at times of a DIAGNOSIS. This inconsistency is due to the existance of "copies", in Medicine called PHENOCOPIES. In other words, a SYNDROME can result from diverse causes, mechanisms and represent diverse DIAGNOSES. What is then a DIAGNOSIS? - it is the synthesis of all of these elements plus the NATURAL HISTORY before and after the DIAGNOSIS. The NATURAL HISTORY is a higher order of fact than the DIAGNOSIS meaning that DIAGNOSIS can not be incompatible and with the "de facto" PROGNOSIS (NATURAL HISTORY). In such contradictions the DIAGNOSIS is false.
If the SIGNS, SIGNALS, PATHOGENESIS and ETIOLOGY sustain the DIAGNOSIS of childhood Down Syndrome and this child becomes a higher order physicist, the NATURAL HISTORY contradicts the DIAGNOSIS which most likely is erroneous.
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