4. Definition
o SIDS is the sudden, unexplained death of an
infant younger than one year old.
o Some people call SIDS "crib death" because many
babies who die of SIDS are found in their cribs.
5. INCIDENCE OF
o SIDS is the leading cause of death in children
between one month and one year old.
o Most SIDS deaths occur when babies are between
2 months & 4 months old
o 6000-7000 babies die of SIDS every year in US
male predominance
the presence of intrathoracic petechiae
linked the death to a sleep period (i.e., the time
when the majority of deaths occurred)
6. PATHOGENESIS
A leading hypothesis - SIDS may reflect a delay or
abnormality in the development of nerve cells within
the brain that are critical to normal heart and lung
function.
brainstems of infants who died with a diagnosis of
SIDS have revealed a developmental delay in the
formation and function of several serotonin-binding
nerve cell pathways within the brain.
The most compelling hypothesis is that SIDS reflects
a delayed development of “arousal” and
cardiorespiratory control
7. The serotonergic (5-HT) system of the
medulla is implicated in these “arousal”
responses, as well as regulation of other critical
homeostatic functions such as respiratory drive,
blood pressure & upper airway reflexes
8. Causes of SIDS ?!
A combination of physical and sleep environmental
factors can make an infant more vulnerable to SIDS.
These factors may vary from child to child.
o Brain abnormalities
o Low birth weight
o Respiratory infection
9. RISK FACTORS
A “triple-risk” model of SIDS has been
proposed, which postulates the
intersection of three overlapping factors:
(1) a vulnerable infant,
(2) a critical developmental period(first 6 months
of life)
(3) an exogenous stressor.
14. o Sleeping on a soft surface. Lying face down
on a fluffy comforter or a waterbed can block an
infant's airway. Draping a blanket over a baby's
head also is risky.
19. In infants and children under 4 years of age:
MC malignant tumours are various types of
blastomas.
Children between 5 to 9 years of age:
haematopoietic malignancies.
In the age range of 10-14 years:
soft tissue & bony sarcomas.
21. Hemangioma
Hemangioma. Hemangiomas are the most
common tumors of infancy
In children, most are located in the skin, particularly
on the face and scalp, where they produce flat to
elevated, irregular, red-blue masses; some of the
flat, larger lesions are referred to as port-wine
stains
Hemangiomas may enlarge along with the growth
of the child, but in many instances they
spontaneously regress
22. Lymphatic Tumors
lymphatic origin
lymphangiomas—are hamartomatous or
neoplastic, whereas others k/s lymphangiectasis.
The lymphangiomas are usually characterized by
cystic and cavernous spaces.
23. Teratomas
Teratomas may occur as benign, well-differentiated cystic
lesions (mature teratomas), immature teratomas, or as
malignant teratomas
two peaks in incidence: the first at - 2 years of age & the
second in late adolescence or early adulthood
Sacrococcygeal teratomas are the most common
teratomas of childhood (40%)
Approximately 75% - mature teratomas
about 12% - unequivocally malignant and lethal.
The remainder is immature teratomas;
27. NEUROBLASTOMA
Neuroblastic tumors include tumors of:
Sympathetic ganglia
Adrenal medulla
These sites have cells derived from
primordial Neural Crest
28. NEUROBLASTOMA
Among Neuroblastic tumors, Neuroblastoma is
the most common extracranial solid tumor of
childhood
It is the most frequently diagnosed tumor of
infancy
Median age of diagnosis is 18 months & 40% are
diagnosed during infancy
29. NEUROBLASTOMA
Germline mutations in Anaplastic Lymphoma
Kinase (ALK) gene is the major cause of familial
predisposition to Neuroblastoma
40% of cases arise in Adrenal medulla
Other sites of involvement are:
Paravertebral region of Abdomen (25%)
Posterior Mediastinum (15%)
Rest of the common sites are Pelvis, Neck & within
the Brain (Cerebral Neuroblastoma)
30. NEUROBLASTOMA
Morphology (Grossly):
Size ranges from small nodules (k/s in-situ lesions) to
large masses weighing more than 1 kg.
In-situ lesions occur more frequently
majority of which regress leaving only a focus of
fibrosis or calcification in the adult
31. NEUROBLASTOMA
Morphology (Grossly):
Some have fibrous pseudocapsules but others are
infiltrative invading surrounding structures
On cut section:
Soft
Composed of Gray-tan tissue
May show areas of Hemorrhage and Necrosis
32.
33. NEUROBLASTOMA
Morphology (Microscopically):
Composed of:
Sheets of small cells with dark nuclei
Scanty cytoplasm
Poorly defined cell borders
Pleomorphism
Mitotic activity
Homer-Wright rosettes may be seen
34.
35. NEUROBLASTOMA
Clinical progress:
In children under 2 years of age, Neuroblastoma
presents with large abdominal mass, fever and
weight loss
In older children, they may not come into attention
until metastasis causing manifestations related to
affected organs such as:
Bone Pain
Respiratory Symptoms
Gastrointestinal Symptoms
36.
37. WILMS TUMOR
Also known as Nephroblastoma
In U.S.A., it is most common primary Renal tumor of
childhood
Peak incidence is seen in the age group of 2-5 years
95% cases occur before the age of 10 years
5-10% cases involve both the kidneys
Synchronous: If both kidneys affected at same time
Metachronous: If affected one after another
38. WILMS TUMOR
The exact cause of Wilms tumor is not clear but in rare cases,
heredity plays a role
Risk factors:
African-American race
Family history of Wilms tumor
Some cases can occur as a part of three syndromes:
WAGR Syndrome
Denys-Drash Syndrome
Beckwith-Wiedemann Syndrome
39. WILMS TUMOR
WAGR Syndrome:
It includes Wilms tumor, Aniridia, Genitourinary system
abnormalities and Mental Retardation
These cases carry germline deletion of chromosome 11p13
This chromosome carry the first Wilms Tumor associated
gene WT1
The lifetime chances of occurrence of Wilms tumor is 33%
40. WILMS TUMOR
Denys-Drash Syndrome:
It includes gonadal dysgenesis and early onset nephropathy
These cases also carry germline abnormalities in WT1 which
affects DNA binding properties
These cases have higher risk of Wilms tumor (~90%)
41. WILMS TUMOR
Beckwith-Wiedemann Syndrome:
This is clinically different from both WAGR & Denys-Drash
syndromes but this also has high risk of developing Wilms
Tumor
This syndrome is characterized by enlargement of body
organs, macroglossia, ear abnormalities & abnormal large
cells in Adrenal Cortex
The chromosome region implicated has been localized to
band 11p15.5 and termed as WT2
42. WILMS TUMOR
Morphology:
Grossly:
Tumor is large, solitary and well circumscribed
10% cases are bilateral or multicentric
On cut section,
• Soft
• Homogenous
• Tan to gray in color
• Occasionally foci of hemorrhage and necrosis
seen
43. Wilms tumor in the lower pole of the
kidney with the characteristic tan-to-gray
color & well-circumscribed margins
44. WILMS TUMOR
Morphology:
microscopically:
Tumor is composed of sheets of small blue cells
5% cases show features of anaplasia i.e. Presence of
cells with nuclei features:
• Large
• Hyperchromatic
• Pleomorphic
• With mitotic figures
45. Focal anaplasia was present in this Wilms tumor
in other areas, characterized by cells with
hyperchromatic, pleomorphic nuclei, and
abnormal mitoses.
46. WILMS TUMOR
Clinical features:
Large abdominal mass which may extend to pelvis
Hematuria
Abdominal pain
Intestinal obstruction
In some cases, pulmonary metastasis is present at
the time of primary diagnosis
48. Alarming environmental degradation
1. Population explosion
2. Urbanisation of rural & forest land to
accommodate the increasing numbers
3. Accumulation of wastes
4. Unsatisfactory disposal of radioactive and
electronic waste
5. Industrial effluents and automobile exhausts
49. Environmental &
nutritional diseases
1. Environmental pollution:
i. Air pollution
ii. Environmental chemicals
iii. Tobacco smoking
2. Chemical and drug injury:
i. Therapeutic (iatrogenic) drug injury
ii. Non-therapeutic toxic agents (e.g. alcohol, lead,
carbon monoxide, drug abuse)
iii. Environmental chemicals
50. 3. Injury by physical agents:
i. Thermal and electrical injury
ii. Injury by ionising radiation
4. Nutritional diseases:
i. Overnutrition (obesity)
ii. Undernutrition (starvation, PEM, vitamin
deficiencies).
51. ENVIRONMENTAL POLLUTION
Any agent— chemical, physical or microbial, that
alters the composition of environment is called
pollutant
air pollution,
environmental chemicals
tobacco smoking.
52. AIR POLLUTION
The adverse effects of air pollutants on lung depend
upon a few variables that include:
i) longer duration of exposure;
ii) total dose of exposure;
iii) impaired ability of the host to clear inhaled particles;
iv) particle size of 1-5 µm capable of getting impacted in
the distal airways to produce tissue injury.
53. ENVIRONMENTAL CHEMICALS
1. Agriculture chemicals
2. Volatile organic solvents
3. Metals Pollution by occupational exposure to
toxic metals such as mercury, arsenic, cadmium,
iron, nickel & aluminium are important hazardous
environmental chemicals.
4. Aromatic hydrocarbons - are contaminant in
several preservatives, herbicides and antibacterial
agents are a chronic health hazard.
5. Cyanide- released by combustion of plastic, silk
6. Environmental dusts
54. TOBACCO SMOKING
The relative risk of major diseases in tobacco
smokers compared from non-smokers
i) Cancer of the lung: 12 to 23 times
ii) COPD: 10-13 times
iii) Cancers of upper aerodigestive tract (larynx,
pharynx, lip, oral cavity, oesophagus): 6 to 14 times
iv) Aortic aneurysm: 6-7 times
v) Other cancers by systemic effects (kidneys,
pancreas, urinary bladder, stomach, cervix): 2-3
times
55. vi) Cerebrovascular accidents (CVA): 2-4 times
vii) Coronary heart disease: 2 to 3 times relative risk
viii) Sudden infant death syndrome: 2 times
ix) Buerger’s disease (thromboangiitis obliterans)
x) Peptic ulcer disease AC 70%higher risk in smokers.
xi) Early menopause in smoker women.
xii) In smoking pregnant women, higher risk of LBW
of foetus, higher perinatal mortality and intellectual
deterioration of newborn.
59. CHEMICAL AND DRUG INJURY
1. Therapeutic (iatrogenic) agents e.g.
drugs, which when administered indiscriminately
are associated with adverse effects.
2. Non-therapeutic agents e.g. alcohol, lead,
carbon monoxide, drug abuse.
60. CHEMICAL AND DRUG INJURY
THERAPEUTIC (IATROGENIC) DRUG INJURY
Adverse effects of drugs may appear due to:
i) overdose;
ii) genetic predisposition;
iii) exaggerated pharmacologic response
iv) interaction with other drugs
v) unknown factors.
66. Adverse drug reaction.
Skin pigmentation caused by minocycline
(a long-acting tetracycline derivative)
Diffuse blue-gray pigmentation of the forearm
67. NON-THERAPEUTIC TOXIC AGENTS
1. ALCOHOLISM
most of the alcohol-related injury to different
organs is due to toxic effects of alcohol and
accumulation of its main toxic metabolite,
acetaldehyde, in the blood.
Other proposed mechanisms of tissue injury in
chronic alcoholism are free-radical mediated
injury and genetic susceptibility to alcohol-
dependence & tissue damage.
70. NON-THERAPEUTIC TOXIC AGENTS
2. LEAD POISONING
Lead poisoning may occur in children or adults
due to accidental or occupational ingestion.
absorbed lead is distributed in two types of
tissues
a) Bones, teeth, nails and hair b) Brain, liver,
kidneys and bone marrow
72. NON-THERAPEUTIC TOXIC AGENTS
3. CARBON MONOXIDE POISONING
CO poisoning may present in 2 ways:
Acute CO poisoning in which there is sudden
development of brain hypoxia characterised by
oedema and petechial haemorrhages.
Chronic CO poisoning presents with nonspecific
changes of slowly developing hypoxia of the brain.
73. INJURY BY RADIATION
most important form of radiation injury is ionising
radiation which has three types of effects on cells:
i) Somatic effects which cause acute cell killing.
ii) Genetic damage by mutations and therefore,
passes genetic defects in the next progeny of cells.
iii) Malignant transformation of cells
74. 1. Skin: radiation dermatitis, cancer.
2. Lungs: interstitial pulmonary fibrosis.
3. Heart: myocardial fibrosis, constrictive pericarditis.
4. Kidney: radiation nephritis.
5. GI tract: strictures of small bowel and oesophagus.
6 Gonads: testicular atrophy & destruction of ovaries.
7. Haematopoietic tissue: pancytopenia due to bone
marrow depression.
8. Eyes: cataract.
75. 4. DRUG ABUSE
use of certain drugs for the purpose of ‘mood alteration’ or
‘euphoria’ or ‘kick’ but subsequently leading to habit-
forming, dependence & eventually addiction
1. Marijuana or ‘pot’ is psychoactive substance – (leaves
of the plant Cannabis sativa) (contains
tetrahydrocannabinol ) (smoked or ingested.
2. Derivatives of opium (heroin and morphine). Opioids
are derived from the poppy plant.
3. CNS depressants - barbiturates, tranquilisers, alcohol.
4. CNS stimulants e.g. cocaine and amphetamines.
5. Psychedelic drugs e.g. LSD.
6. lnhalants e.g. glue, paint thinner, nail polish remover,
aerosols, amyl nitrite.