Medical Conditions

Recognizing Signs of Soft Tissue Tumors in Children

Medically reviewed by Dr. Michael Okonkwo, MD, FAAP · Board-Certified Neonatologist

Content reviewed against published NIH, AAP, Mayo Clinic guidelines

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If your baby has been diagnosed with or you suspect recognizing signs of soft tissue tumors in children, here is what the evidence says.

The short answer

Rhabdomyosarcoma is the most common soft tissue tumor in children, typically occurring before age 6. It can develop anywhere in the body but commonly in the head/neck, urinary/reproductive tract, or limbs. Signs depend on location: a visible or palpable growing mass, eye bulging (orbital tumor), nasal obstruction or bloody discharge (nasal tumor), or urinary problems (pelvic tumor). With modern treatment including chemotherapy, surgery, and radiation, cure rates are improving.

Key takeaways

  • Rhabdomyosarcoma is the most common soft tissue tumor in children, typically occurring before age 6. It can develop anywhere in the body but commonly in the head/neck, urinary/reproductive tract, or limbs. Signs depend on location: a visible or palpable growing mass, eye bulging (orbital tumor), nasal obstruction or bloody discharge (nasal tumor), or urinary problems (pelvic tumor). With modern treatment including chemotherapy, surgery, and radiation, cure rates are improving.
  • Usually normal when: A small, soft, mobile lump that is not growing (likely a benign cyst or lymph node)
  • Call your doctor if: A rapidly growing mass causing pain, neurological symptoms, or functional impairment
  • Varies by age — see the age-by-age breakdown below
“Fever itself is not an illness — rather, it is a sign or symptom that the body is fighting an infection. Fever stimulates certain defenses, such as the white blood cells, which attack and destroy invading bacteria.”
— Fever and Your Child, American Academy of Pediatrics (AAP)

Parents everywhere have the same worry. You are doing the right thing by looking into it.

What Parents Should Know

According to NIH, AAP, Mayo Clinic guidelines, rhabdomyosarcoma is the most common soft tissue tumor in children, typically occurring before age 6. It can develop anywhere in the body but commonly in the head/neck, urinary/reproductive tract, or limbs. Signs depend on location: a visible or palpable growing mass, eye bulging (orbital tumor), nasal obstruction or bloody discharge (nasal tumor), or urinary problems (pelvic tumor). With modern treatment including chemotherapy, surgery, and radiation, cure rates are improving. At 0-12 months, rhabdomyosarcoma can occur in infancy, particularly the embryonal subtype. A growing mass anywhere on the body that is firm and does not transilluminate (light does not pass through it) should be evaluated. Common infant sites include the head, neck, and pelvic area. It is generally considered normal when a small, soft, mobile lump that is not growing (likely a benign cyst or lymph node). However, you should contact your pediatrician promptly if a rapidly growing mass causing pain, neurological symptoms, or functional impairment.

Sources: [1], [2], [3]

Normal vs. Concerning

Usually Normal
Worth Discussing
A small, soft, mobile lump that is not growing (likely a benign cyst or lymph node)
A rapidly growing mass causing pain, neurological symptoms, or functional impairment
Swelling associated with an identifiable injury that is resolving
Eye bulging, vision changes, or breathing difficulty from a growing mass
A lump that your pediatrician has evaluated and determined to be benign
A lump that is firm, seems fixed, and has been growing over weeks

By Age

What to expect by age

0-12 months

Rhabdomyosarcoma can occur in infancy, particularly the embryonal subtype. A growing mass anywhere on the body that is firm and does not transilluminate (light does not pass through it) should be evaluated. Common infant sites include the head, neck, and pelvic area.

12-24 months

A progressively growing lump, eye changes (bulging eye, drooping eyelid), chronic nasal congestion with bloody discharge from one nostril, or urinary symptoms without infection may indicate soft tissue tumor. These symptoms have many benign causes but persistent or progressive ones warrant evaluation.

2-3 years

Peak age for some subtypes of rhabdomyosarcoma. Any painless, firm, progressively growing mass should be evaluated. Orbital rhabdomyosarcoma may cause rapid eye bulging. Genitourinary tumors may present with blood in urine or a vaginal or urethral mass.

3-5 years

Rhabdomyosarcoma continues to be a risk. A mass that grows over weeks, does not respond to antibiotics (if initially thought to be an infection), or is associated with neurological symptoms (if near the brain or spine) needs imaging and likely biopsy.

5+ years

The alveolar subtype becomes more common in adolescence. Any unexplained, progressively growing soft tissue mass should be evaluated with imaging (ultrasound, then MRI) and possible biopsy.

What to Tell Your Pediatrician

  • Describe when you first noticed recognizing signs of soft tissue tumors in children and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if a lump that is firm, seems fixed, and has been growing over weeks.
  • Mention if persistent one-sided nasal obstruction with bloody discharge.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

What Should You Do?

When to take action

Probably normal when...
  • A small, soft, mobile lump that is not growing (likely a benign cyst or lymph node)
  • Swelling associated with an identifiable injury that is resolving
  • A lump that your pediatrician has evaluated and determined to be benign
Mention at your next visit when...
  • A lump that is firm, seems fixed, and has been growing over weeks
  • Persistent one-sided nasal obstruction with bloody discharge
  • A growing mass near the eye, in the neck, or in the groin area
Act now when...
  • A rapidly growing mass causing pain, neurological symptoms, or functional impairment
  • Eye bulging, vision changes, or breathing difficulty from a growing mass

What You Can Do at Home

  • Keep track of when you notice recognizing signs of soft tissue tumors in children — noting the time of day, duration, and any triggers can help your pediatrician.
  • Remember that a small, soft, mobile lump that is not growing (likely a benign cyst or lymph node) — this is generally within the range of normal.
  • At 0-12 months, focus on observation rather than intervention unless your pediatrician advises otherwise.
  • Follow any care instructions from your pediatrician. Keep a written log of symptoms to bring to appointments.
  • While monitoring at home, seek immediate care if a rapidly growing mass causing pain, neurological symptoms, or functional impairment.

I Feel a Lump in My Baby's Abdomen

An abdominal mass in a baby should always be evaluated by your pediatrician. Common benign causes include stool in the colon (constipation), a full bladder, or the liver or spleen edge felt normally. Less common causes include kidney abnormalities, cysts, and rarely tumors (Wilms tumor, neuroblastoma). Your pediatrician will examine the mass and likely order an abdominal ultrasound for further evaluation. Early detection of any condition leads to better outcomes.

I Found a Lump on My Baby Boy's Testicle

A lump or swelling in a baby's scrotum is most commonly a hydrocele (fluid collection) or inguinal hernia, both of which are benign and common. However, any new, firm, painless testicular mass should be evaluated by your pediatrician to rule out rare conditions including testicular tumors. Hydroceles transilluminate (glow when a light is shone through them), while solid masses do not. Most testicular masses in babies are benign, but prompt evaluation is important.

Neuroblastoma Signs in Babies

Neuroblastoma is the most common cancer in infants, accounting for about 6-10% of all childhood cancers. It develops from immature nerve cells and most commonly appears as a mass in the abdomen (adrenal gland), chest, neck, or pelvis. About 90% of cases are diagnosed before age 5, with a median age of diagnosis around 18 months. Babies under 1 year have the best prognosis, with many low-risk tumors even regressing on their own without treatment.

Milestone

Month-by-Month Development

Detailed monthly development guides from birth through 24 months.

Guide

When to Call the Doctor

General guide on when to call the pediatrician, visit urgent care, or go to the ER.

Frequently asked questions

Is recognizing signs of soft tissue tumors in children normal?
Rhabdomyosarcoma is the most common soft tissue tumor in children, typically occurring before age 6. It can develop anywhere in the body but commonly in the head/neck, urinary/reproductive tract, or limbs. Signs depend on location: a visible or palpable growing mass, eye bulging (orbital tumor), nasal obstruction or bloody discharge (nasal tumor), or urinary problems (pelvic tumor). With modern treatment including chemotherapy, surgery, and radiation, cure rates are improving.
When should I call the doctor about recognizing signs of soft tissue tumors in children?
A rapidly growing mass causing pain, neurological symptoms, or functional impairment Eye bulging, vision changes, or breathing difficulty from a growing mass
When is recognizing signs of soft tissue tumors in children normal?
A small, soft, mobile lump that is not growing (likely a benign cyst or lymph node) Swelling associated with an identifiable injury that is resolving A lump that your pediatrician has evaluated and determined to be benign
What causes recognizing signs of soft tissue tumors in children?
Rhabdomyosarcoma is the most common soft tissue tumor in children, typically occurring before age 6. It can develop anywhere in the body but commonly in the head/neck, urinary/reproductive tract, or limbs. Signs depend on location: a visible or palpable growing mass, eye bulging (orbital tumor), nasal obstruction or bloody discharge (nasal tumor), or urinary problems (pelvic tumor). With modern treatment including chemotherapy, surgery, and radiation, cure rates are improving. Common explanations include: A small, soft, mobile lump that is not growing (likely a benign cyst or lymph node). Swelling associated with an identifiable injury that is resolving.
What should I mention to my pediatrician about recognizing signs of soft tissue tumors in children?
You should mention recognizing signs of soft tissue tumors in children at your next visit if: A lump that is firm, seems fixed, and has been growing over weeks. Persistent one-sided nasal obstruction with bloody discharge. A growing mass near the eye, in the neck, or in the groin area.
Is recognizing signs of soft tissue tumors in children normal at 0-12 months?
Rhabdomyosarcoma can occur in infancy, particularly the embryonal subtype. A growing mass anywhere on the body that is firm and does not transilluminate (light does not pass through it) should be evaluated. Common infant sites include the head, neck, and pelvic area.
Is recognizing signs of soft tissue tumors in children normal at 12-24 months?
A progressively growing lump, eye changes (bulging eye, drooping eyelid), chronic nasal congestion with bloody discharge from one nostril, or urinary symptoms without infection may indicate soft tissue tumor. These symptoms have many benign causes but persistent or progressive ones warrant evaluation.
Should I go to the ER for recognizing signs of soft tissue tumors in children?
Seek emergency care if a rapidly growing mass causing pain, neurological symptoms, or functional impairment, or if eye bulging, vision changes, or breathing difficulty from a growing mass. When in doubt, call your pediatrician's after-hours line for guidance.
Does recognizing signs of soft tissue tumors in children go away on its own?
In many cases, recognizing signs of soft tissue tumors in children resolves on its own, especially when a small, soft, mobile lump that is not growing (likely a benign cyst or lymph node). By 5+ years, the alveolar subtype becomes more common in adolescence. Any unexplained, progressively growing soft tissue mass should be evaluated with imaging (ultrasound, then MRI) and possible biopsy.
NIHAAPMAYO CLINIC

References

  1. [1]National Cancer Institute. Childhood Rhabdomyosarcoma Treatment. NIH
  2. [2]American Academy of Pediatrics. Childhood Cancers. AAP
  3. [3]Mayo Clinic. Rhabdomyosarcoma. Mayo Clinic

Doctor Visit Checklist

Bring this checklist to your next pediatrician visit to discuss Recognizing Signs of Soft Tissue Tumors in Children.

Things to mention

  • Describe when you first noticed recognizing signs of soft tissue tumors in children and how it has changed over time.
  • Note your baby's current age and which age-specific patterns you are seeing.
  • Mention if a lump that is firm, seems fixed, and has been growing over weeks.
  • Mention if persistent one-sided nasal obstruction with bloody discharge.
  • Let your doctor know if you have noticed any related concerns, such as changes in feeding, sleep, or movement patterns.
  • Bring a list of any questions or observations you want to discuss at the appointment.

Observations to share

  • A lump that is firm, seems fixed, and has been growing over weeks
  • Persistent one-sided nasal obstruction with bloody discharge
  • A growing mass near the eye, in the neck, or in the groin area

Urgent signs to report immediately

  • A rapidly growing mass causing pain, neurological symptoms, or functional impairment
  • Eye bulging, vision changes, or breathing difficulty from a growing mass

My notes

From ismybabyalright.com — free, evidence-based baby health guides

All content follows our editorial policy and is reviewed against published clinical guidelines.

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Bottom line

Most cases of recognizing signs of soft tissue tumors in children are normal. Talk to your pediatrician if a rapidly growing mass causing pain, neurological symptoms, or functional impairment.

Trust your instincts. If something feels wrong, reach out to your pediatrician. Worrying about your baby means you care — that is a good thing.

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I Feel a Lump in My Baby's Abdomen

An abdominal mass in a baby should always be evaluated by your pediatrician. Common benign causes include stool in the colon (constipation), a full bladder, or the liver or spleen edge felt normally. Less common causes include kidney abnormalities, cysts, and rarely tumors (Wilms tumor, neuroblastoma). Your pediatrician will examine the mass and likely order an abdominal ultrasound for further evaluation. Early detection of any condition leads to better outcomes.

I Found a Lump on My Baby Boy's Testicle

A lump or swelling in a baby's scrotum is most commonly a hydrocele (fluid collection) or inguinal hernia, both of which are benign and common. However, any new, firm, painless testicular mass should be evaluated by your pediatrician to rule out rare conditions including testicular tumors. Hydroceles transilluminate (glow when a light is shone through them), while solid masses do not. Most testicular masses in babies are benign, but prompt evaluation is important.

Neuroblastoma Signs in Babies

Neuroblastoma is the most common cancer in infants, accounting for about 6-10% of all childhood cancers. It develops from immature nerve cells and most commonly appears as a mass in the abdomen (adrenal gland), chest, neck, or pelvis. About 90% of cases are diagnosed before age 5, with a median age of diagnosis around 18 months. Babies under 1 year have the best prognosis, with many low-risk tumors even regressing on their own without treatment.

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