Mateo's Complete Clinical Story (and His Diagnosis)
Take the reading one piece at a time. For each piece: read it once, underline the sentence that says what happens, then look up any word in the list. Tap a word to see its definition.
Piece 1 of 2
Lay out the case file; each row is a clue and what it argues. A complete unilateral left cleft lip and palate with no other anomalies on the newborn exam (L1, L2) argues for a cleft that travels alone. No lower-lip pits (L3, L4) argues against Van der Woude, the most common syndromic cleft. A negative dysmorphology exam and microarray, plus the very low microarray yield for isolated cleft lip/palate (L5), argue against a chromosomal or single-gene syndrome. Unaffected parents with a sparse, ambiguous family history and no clean dominant pattern (the population and causes lessons) argue against simple Mendelian inheritance. Mateo's profile fitting the common population pattern (CL/P is the most common craniofacial birth defect, about 1 in 700, more common in males, usually left-sided when unilateral) fits the common, multifactorial form. Causes tracing to many small genetic and environmental contributors argue multifactorial, not single-gene. And a recurrence risk for unaffected parents with one affected child of about 2 to 5 percent (the data tables give about 4.4 percent for CLP), not 50 percent, fits a multifactorial threshold rather than dominant inheritance.
Piece 2 of 2
Two explanations were on the table from Lesson 3. Explanation A: Mateo's cleft is one feature of a hidden syndrome. Explanation B: Mateo's cleft is isolated, the only finding, caused by many small genetic and environmental factors together. The evidence board is how you decide, and it points to B.
Reading the Research
- Skim the title and abstract first to get the gist.
- Circle the one sentence that states the main claim.
- Box the evidence the authors give for that claim.
- Mark one sentence that confuses you, and move on.
Now put it together: In one or two sentences, say what this whole reading is telling you about Mateo. Then go back to the lesson and fill in the guided notes.