Poland's Syndrome-CT

The absence of the sternal head of the pectoralis major muscle is considered the minimal expression of poland's syndrome. The skin of the area is hypoplastic with a thinned subcutaneous layer, and the axillary hair may be absent. The ipsilateral nipple is often smaller and higher in both male and female patients, and the breast is generally hypoplastic in female patients. Incidentally reported in this case.
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Levator claviculae muscle-CT appearance of an unusual variant

The levator claviculae muscle is an infrequently recognized variant in humans, occurring in 2% to 3% of the population, and has rarely been reported in the radiologic or anatomic literature. The importance of this muscle to radiologists is in distinguishing it from an abnormality; most commonly, cervical adenopathy. It arises from the transverse processes of the upper cervical vertebrae and inserts in the lateral half of the clavicle. Reference- AJNR Am J Neuroradiol 20:583–586, April 1999

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Congenital Absence of Adductor Muscles

Note is made of absence of the adductor group of muscles on the right side consistent with congenital absence. There is relative hypertrophy of the fatty tissue on the right side. This is a 9month old female with suspected CDH.

Further reading
Pediatr Radiol. 1981;11(3):157-9. Unilateral absence of thigh muscles confirmed by CT scan. Peterson JE, Currarino G