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Differential diagnosis of numbness at right sole

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Merck Manual numbness foot differential diagnosis plantar surface tibial nerve S1 radiculopathy

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foot numbness AND differential diagnosis

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https://www.merckmanuals.com/professional/neurologic-disorde…

Right sole numbness is most often a focal nerve problem, but the differential depends on the exact area involved and associated symptoms.

Main differential diagnosis

  1. Tarsal tunnel syndrome, tibial nerve compression at the medial ankle
    • Tingling, burning, or numbness in the sole, toes, and sometimes heel.
    • Often worse after prolonged standing/walking or at night.
    • May follow ankle injury, flat feet, swelling, tenosynovitis, or a mass.
    • A Tinel sign behind the medial malleolus supports it. Tibial entrapment causes sensory loss over the sole. Bradley and Daroff's Neurology in Clinical Practice, p. 2642.
  2. Distal medial or lateral plantar nerve entrapment
    • Medial plantar nerve: medial arch and plantar aspect of the first 3 to 3.5 toes.
    • Lateral plantar nerve: lateral sole and fourth/fifth toes.
    • Often associated with running, repetitive impact, footwear, or foot biomechanics. Clinical assessment is usually the starting point. Merck Manual review
  3. S1 radiculopathy, commonly from L5-S1 disc disease
    • Numbness usually includes the lateral foot, sole, and little toe.
    • Look for radiating low-back/buttock pain down the posterior leg, weak plantar flexion, or reduced Achilles reflex.
    • Coughing, straining, or spinal movement may aggravate radicular symptoms. Localization in Clinical Neurology, 8th ed., p. 223. Merck radiculopathy patterns
  4. Sciatic neuropathy or lumbosacral plexopathy
    • More extensive sensory symptoms involving the leg and foot, often with weakness.
    • Consider after pelvic/hip trauma, surgery, injection injury, a pelvic mass, or prolonged compression.
  5. Peripheral polyneuropathy
    • Diabetes, alcohol use, vitamin B12 deficiency, hypothyroidism, chronic kidney disease, medications/toxins, and chemotherapy.
    • Usually affects both feet in a stocking pattern, but early disease can be asymmetric. Merck numbness evaluation
  6. Local trauma or pressure
    • Tight footwear, prolonged kneeling/squatting, a recent ankle sprain/fracture, scar tissue, edema, or compression during sleep/sitting.
  7. Less common but important
    • Vascular compromise: cold, pale/blue foot, severe pain, weak pulses.
    • Compartment syndrome: usually after trauma or vigorous exertion, with severe escalating pain, pain on passive toe movement, tense swelling, and sensory loss over the sole.
    • Central neurologic lesion such as stroke or spinal cord disease is unlikely with isolated sole numbness, but must be considered if there are other neurologic deficits.

Pattern clues

FindingMore suggestive cause
Sole plus heel affectedTibial nerve/tarsal tunnel proximal to heel branch
Medial sole/arch, first toesMedial plantar nerve
Lateral sole/little toe plus posterior leg symptomsS1 radiculopathy or sciatic lesion
Both feet, gradual onsetPolyneuropathy
Back pain radiating down leg, Achilles-reflex changeS1 radiculopathy
Symptoms worse with walking/standing, medial ankle tendernessTarsal tunnel

Seek urgent assessment now if

  • Sudden onset with facial droop, arm weakness, speech or balance trouble
  • New leg weakness, foot drop, inability to stand on toes
  • New bladder/bowel dysfunction or numbness around the groin/perineum
  • A cold, pale/blue, severely painful foot
  • Rapid progression, severe swelling, or numbness after significant trauma
Assessment should include mapping sensation, ankle/toe strength, Achilles reflex, pulses, back examination, and Tinel testing at the tarsal tunnel. Depending on findings, tests may include glucose/HbA1c, B12/thyroid studies, nerve-conduction studies/EMG, ankle ultrasound or MRI, or lumbar MRI.

Its my mum. No pain no weakness. Only numbness. But she has underlying vestibular schwannoma

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vestibular schwannoma symptoms hearing balance facial numbness extremity numbness official

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vestibular schwannoma AND symptoms

An isolated numb patch on one sole is not a typical symptom of a vestibular schwannoma. Vestibular schwannomas mainly affect hearing and balance; if large, they may cause facial numbness on the affected side or limb incoordination, rather than numbness limited to one foot. The NHS symptom summary describes facial sensory symptoms and one-sided coordination problems with larger lesions.
With no pain or weakness, a local tibial/plantar nerve issue or a mild S1 nerve-root issue remains more likely than the vestibular schwannoma itself. However, because this is a new one-sided sensory symptom in someone with a known intracranial tumour, she should contact her treating neurosurgery/ENT/neurology team or GP today or on the next working day for advice and an examination. They can decide whether her surveillance MRI needs to be brought forward and whether the pattern points instead to the ankle, peripheral nerve, or lower back.
Seek emergency care now if the numbness was sudden in onset, is spreading, or she develops any of the following:
  • facial droop, speech difficulty, confusion, severe headache, new visual symptoms
  • new imbalance beyond her usual symptoms, clumsiness, or weakness
  • numbness of the whole leg or arm, or on both sides
  • loss of bladder/bowel control or numbness around the groin
  • a cold, pale, blue, or painful foot.
Useful details to tell the clinician: exact time it began, whether it is constant, whether it involves the heel/toes/little toe, recent ankle injury or tight footwear, back pain/sciatica, diabetes, and the side and latest MRI status of the vestibular schwannoma.
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