asmi
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A 3 months old male baby was brought in your clinic ,parents complain that child is having swelling in neck since birth .The lump in neck was identified to be of thymus tissue.Then what you will look for further..? what other tissue is likely to be present ....?
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| dxtxpx
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parotid gland
Thymic cysts: Seen rarely as a neck mass, these masses arise from thymic remnants along its course from the mandible to the midline of the neck. The thymus gland is derived from the inferior aspect of the third pharyngeal pouch at the sixth week of fetal life. It descends into the thorax by the ninth week maintaining its relationship with the pericardium. The inferior parathyroid glands are also derived form the third branchial pouch but from the superior aspect. While the thymus gland descends, there remains a connection to the third branchial pouch, referred to as the thymopharyngeal duct. This duct normally degenerates and is completely obliterated by the eight or ninth week. It is the persistence of this duct that explains the presence of cervical thymic cysts. These lesions may be found midline or in the lateral neck reflecting the overall course of descent near the angle of the mandible to the midline of the neck. Surgical excision is the treatment.
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| anne
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but why would parotid be present in neck?
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| asmi
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but the answer given is parathyroid gland
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| dxtxpx
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anne where is parathyroid gland present normally? think about it.
And once again, parathyroid and thymus have same origin: third pharyngeal pouch.
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| anne
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but u had written parotid rather than parathyroid gland---must be a typing error. 
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| asmi
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whatever guys point to be noted is since 3rd pharyngeal pouch gives rise to both of them , so if we get a Q with one developmental anamoly..we have to keep this in mind.
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| dxtxpx
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o sorry yes a typo :oops: sorry anne about the confusion :oops:
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