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is a significant concern for physicians. Central! n- c8 \8 M6 Y1 f; o7 |3 o9 I: z
precocious puberty (CPP), which is mediated8 G8 Z# a7 \9 |( E5 f
through the hypothalamic pituitary gonadal axis, has
1 n- l/ H6 b, f+ j/ Ma higher incidence of organic central nervous system3 B' X% a+ r; S8 @- v7 w, a4 h
lesions in boys.1,2 Virilization in boys, as manifested& B6 Z* ~2 T6 c
by enlargement of the penis, development of pubic, \7 t& f- G: g! p' S1 _/ _4 x
hair, and facial acne without enlargement of testi-' \- [! M4 F5 P7 S# J- r
cles, suggests peripheral or pseudopuberty.1-3 We9 F, Y( U# g3 G
report a 16-month-old boy who presented with the: }2 d5 Q' M) p5 X, d5 l
enlargement of the phallus and pubic hair develop-8 O# }+ T5 w U9 u4 m1 t
ment without testicular enlargement, which was due9 j: c# M4 v+ w: D( ~$ L3 C
to the unintentional exposure to androgen gel used by/ B" s0 [/ G' k4 |9 m
the father. The family initially concealed this infor-) B- d: B! Q; D: [7 w
mation, resulting in an extensive work-up for this
" L) h: \1 D, Q1 Q/ T8 s1 S$ l8 o5 bchild. Given the widespread and easy availability of) d. J* o8 U- j# d
testosterone gel and cream, we believe this is proba-7 {0 A$ K9 U7 G* b
bly more common than the rare case report in the" e& K X; Y" t9 W- M2 \
literature.4( \6 m6 ?7 b" R& u5 |9 R
Patient Report
+ h( f* l& y: Y H2 N6 GA 16-month-old white child was referred to the$ }" W" T& g5 D/ _* p% e' K
endocrine clinic by his pediatrician with the concern
5 H! v/ ~& J8 cof early sexual development. His mother noticed- P8 H, ]4 O; w( Q, r( j
light colored pubic hair development when he was
+ Y* w/ |: E6 ~6 r4 }: CFrom the 1Division of Pediatric Endocrinology, 2University of$ X% |( k% m+ ]( s& J/ H, L; f
South Alabama Medical Center, Mobile, Alabama.' K# x5 g( L6 z' v: w1 Q
Address correspondence to: Samar K. Bhowmick, MD, FACE,
* Y8 @& n; T5 ]Professor of Pediatrics, University of South Alabama, College of
/ s* ^' P4 a8 p7 oMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;5 ~- N5 Q( O0 X7 T4 s l. z
e-mail: [email protected].5 n, M l, Y% U$ U
about 6 to 7 months old, which progressively became
. S0 \: W6 Z# Ndarker. She was also concerned about the enlarge-$ S' j6 d' d; l( g9 i8 L
ment of his penis and frequent erections. The child
0 ` H3 G! h/ k+ Dwas the product of a full-term normal delivery, with
2 M# O/ [' h! h' |' Ba birth weight of 7 lb 14 oz, and birth length of
* s. S' j' J5 |; U20 inches. He was breast-fed throughout the first year
+ P7 J. G% A* rof life and was still receiving breast milk along with. y6 D; ~' N; B
solid food. He had no hospitalizations or surgery,/ d) u' } Q8 V
and his psychosocial and psychomotor development
# k1 p+ a, {, W$ J* @was age appropriate.2 J- X9 u' M0 S/ j. G9 ]
The family history was remarkable for the father,
8 d# i8 ?3 ^9 S7 i$ Y% ~" rwho was diagnosed with hypothyroidism at age 16,+ c9 ]. D, O: M+ K6 W
which was treated with thyroxine. The father’s" o3 v/ X- j" S, ` M* M
height was 6 feet, and he went through a somewhat
, z9 @3 ?+ y7 |early puberty and had stopped growing by age 14.
9 l6 d' v. E3 t0 c( QThe father denied taking any other medication. The5 N g2 ?& m! ~
child’s mother was in good health. Her menarche7 J' ~4 M' n6 h
was at 11 years of age, and her height was at 5 feet
" U: \, N5 F( E6 j* k5 inches. There was no other family history of pre-
+ B! Z) `4 X* f( v1 x+ }% gcocious sexual development in the first-degree rela-/ X( C5 w% n* x! @
tives. There were no siblings.
) [$ m5 h4 i% q, J: l! g, e3 P3 tPhysical Examination* U- Y \' o( m" L7 t% n' I) f. i, W" Y
The physical examination revealed a very active,* N8 W7 U* m/ X* O1 m3 P
playful, and healthy boy. The vital signs documented
9 d$ l) _$ `* X3 P. N/ w9 za blood pressure of 85/50 mm Hg, his length was
- L% Y0 Q' p$ ]: n7 V90 cm (>97th percentile), and his weight was 14.4 kg, X$ N+ j5 `( t
(also >97th percentile). The observed yearly growth
% W- C' s! W+ A- Bvelocity was 30 cm (12 inches). The examination of: M# X. R; F# V, `9 l* p
the neck revealed no thyroid enlargement.- z7 ^$ x1 R& w4 x7 z9 \' g8 f1 r
The genitourinary examination was remarkable for9 `$ x) [) y2 i/ T4 Z
enlargement of the penis, with a stretched length of
, m) h/ y1 N% ?" G: R6 i8 cm and a width of 2 cm. The glans penis was very well, a! O7 {+ a" v. w3 v
developed. The pubic hair was Tanner II, mostly around
' H& o( ^2 ^" O2 i. F. x540/ G4 {/ Z' {3 z1 Z( X; D
at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
) i9 T Y* {, sthe base of the phallus and was dark and curled. The
9 |5 G2 L) ~5 {8 @. r) L8 ltesticular volume was prepubertal at 2 mL each.1 h3 W+ e) p$ A! ~
The skin was moist and smooth and somewhat0 J" z! `$ Y" g4 I) s, J
oily. No axillary hair was noted. There were no
# K @# L/ o, ^+ Vabnormal skin pigmentations or café-au-lait spots.
% u' t4 g: i6 |2 G2 M. UNeurologic evaluation showed deep tendon reflex 2+
! `1 ~, I' l4 J; \ vbilateral and symmetrical. There was no suggestion3 h `6 M5 [# I) j( b( F' V) k
of papilledema./ i2 {' a! \2 u( j
Laboratory Evaluation& x. }) H* L2 y0 A3 M0 _: ]
The bone age was consistent with 28 months by& t: t* x. n/ i/ |
using the standard of Greulich and Pyle at a chrono-3 X5 k- \$ j" q* }+ m7 @; l
logic age of 16 months (advanced).5 Chromosomal
J8 U- j( V! H3 fkaryotype was 46XY. The thyroid function test
8 _& L- _! r3 }0 F. E: O* E9 Rshowed a free T4 of 1.69 ng/dL, and thyroid stimu-) Y9 K5 W7 x8 r6 s* l% K9 q* N! `
lating hormone level was 1.3 µIU/mL (both normal).
; F& }5 k' C$ J, P% XThe concentrations of serum electrolytes, blood
2 A) V. a% g* k& B7 Y( gurea nitrogen, creatinine, and calcium all were
4 H/ o' B/ q! i; K- o* @- Iwithin normal range for his age. The concentration
+ u9 G9 ~4 Q5 X; c8 G0 W! Oof serum 17-hydroxyprogesterone was 16 ng/dL
2 Z5 {# P- {$ O4 T1 ~1 z+ |(normal, 3 to 90 ng/dL), androstenedione was 20
3 p4 a/ {1 E3 Q; F" _& hng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-$ U; @* _$ D5 d8 D$ Y' B) l
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
6 H7 V; ?0 L- [ ]& P; `0 v* jdesoxycorticosterone was 4.3 ng/dL (normal, 7 to8 W# n& v5 N8 U1 I/ b5 k4 K+ K
49ng/dL), 11-desoxycortisol (specific compound S)6 V$ a- O$ D3 }/ X: J9 v
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-4 V+ [7 t+ u/ ^: L
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total
2 {6 W5 l* P$ o- ?, ?- @/ Atestosterone was 60 ng/dL (normal <3 to 10 ng/dL),. n1 T9 x2 e, W& Q/ j y. `
and β-human chorionic gonadotropin was less than
+ ~ K2 ^- s% Q: _" s, s/ U5 mIU/mL (normal <5 mIU/mL). Serum follicular
( ?: U. D3 ]+ i2 G2 t% e# gstimulating hormone and leuteinizing hormone* n, s0 r7 M! _+ a+ `- y
concentrations were less than 0.05 mIU/mL
" Y: F8 m- I3 ~1 J/ _! c' o a(prepubertal).
^- P# a7 ]; l* T3 o1 \The parents were notified about the laboratory/ s& o( c, @: j
results and were informed that all of the tests were* M) z q: t- a- \; D
normal except the testosterone level was high. The0 O) H; z. ]0 E
follow-up visit was arranged within a few weeks to# K' O* Y4 U1 L! r
obtain testicular and abdominal sonograms; how-/ y9 E. r8 d, v6 y2 C& B# S- x
ever, the family did not return for 4 months.
0 G1 l, Q. ]: RPhysical examination at this time revealed that the! _# b P7 V+ [+ F
child had grown 2.5 cm in 4 months and had gained
: I: O: f+ G) S- e3 g2 kg of weight. Physical examination remained
; d, @' C1 m- G# r9 eunchanged. Surprisingly, the pubic hair almost com- k1 W, z0 B' z7 ]
pletely disappeared except for a few vellous hairs at
7 [$ v' t! C3 G% Hthe base of the phallus. Testicular volume was still 2( ?6 p/ M2 s- W1 E5 c# k: n
mL, and the size of the penis remained unchanged.
7 m2 R" Z7 {: L( q" MThe mother also said that the boy was no longer hav-
) \: v# p: S( Zing frequent erections.
' m4 e* f6 A8 D. n7 ^Both parents were again questioned about use of
9 ]. u5 e% w2 h4 V% ]& I) Jany ointment/creams that they may have applied to4 `8 y7 C; j5 R7 N
the child’s skin. This time the father admitted the
) O, e0 l, n+ R& fTopical Testosterone Exposure / Bhowmick et al 541
$ ~+ E Z& n6 ~# }use of testosterone gel twice daily that he was apply-0 O5 g8 L0 r0 r( K
ing over his own shoulders, chest, and back area for- K$ q$ ]: b) q. E9 K. q
a year. The father also revealed he was embarrassed( P- x$ P) y" q7 q* @+ l
to disclose that he was using a testosterone gel pre-
4 E( M/ f$ i' u' s* P; @scribed by his family physician for decreased libido2 N( n L: X9 S
secondary to depression.
a# U M% ~" U1 dThe child slept in the same bed with parents.$ e: g" H9 U* _ k7 q5 Q
The father would hug the baby and hold him on his
8 G/ L8 _. s+ P2 ~% k8 ichest for a considerable period of time, causing sig-
+ q5 i5 b! w6 H7 M3 w, ^nificant bare skin contact between baby and father.5 Q7 z% G- ?- W3 X. b
The father also admitted that after the phone call,
$ M- B+ f* t$ `$ X. ]7 O5 x4 _' uwhen he learned the testosterone level in the baby
, Z" z2 o: e9 l H1 ywas high, he then read the product information2 i; e3 P0 k1 M9 w2 W
packet and concluded that it was most likely the rea-6 H3 o! x- C2 J+ j
son for the child’s virilization. At that time, they
& Y1 F( y6 J) ~! x0 h0 f4 ]+ Z2 |decided to put the baby in a separate bed, and the6 }: K/ C% s; X2 M7 _; i( C- O' S
father was not hugging him with bare skin and had( H5 b' F" `) s8 M7 s
been using protective clothing. A repeat testosterone9 x* E: q2 A* L/ s* p( b$ O$ Y
test was ordered, but the family did not go to the
( L5 n4 n" j* l) Y- @* Elaboratory to obtain the test.* b! i" y O' p& O; ~& h
Discussion H+ @4 `0 k+ s6 F) X. Q+ B" i. p
Precocious puberty in boys is defined as secondary
$ v U( Z' M' p3 h- O. Bsexual development before 9 years of age.1,49 m2 _- F# P/ E X- o; P
Precocious puberty is termed as central (true) when' B6 {' f& z+ q5 i( @' K2 L3 }# a( a
it is caused by the premature activation of hypo-+ c, m# [, x9 o" U
thalamic pituitary gonadal axis. CPP is more com- W% H/ J- J& x# |
mon in girls than in boys.1,3 Most boys with CPP- T W8 t0 {, R
may have a central nervous system lesion that is3 W" _, S0 g1 H( m d' n/ _
responsible for the early activation of the hypothal-$ K1 V7 o. }5 o* E) ^
amic pituitary gonadal axis.1-3 Thus, greater empha-
$ c7 W' `! B& lsis has been given to neuroradiologic imaging in
5 s5 a9 R! \/ p5 ]' Iboys with precocious puberty. In addition to viril-
! V5 r2 o) s, Mization, the clinical hallmark of CPP is the symmet-& C e3 ? b( n. x5 H+ k
rical testicular growth secondary to stimulation by
7 P: s" y: l% B" d+ agonadotropins.1,3$ z6 Z! j% f8 [: I& R. s. N% H
Gonadotropin-independent peripheral preco-
+ _2 K) C7 I m; scious puberty in boys also results from inappropriate
3 ~# u' ^6 Q+ h a6 P* s# f* `& Mandrogenic stimulation from either endogenous or* |( w M Z: p- i/ T0 P; R
exogenous sources, nonpituitary gonadotropin stim-2 o- K" W- w; Q% z, z3 \
ulation, and rare activating mutations.3 Virilizing
! ^7 T& u' S$ R+ z J, p& Lcongenital adrenal hyperplasia producing excessive- H/ q! t7 s. |+ E! P
adrenal androgens is a common cause of precocious* I4 n/ p$ ~( K2 s
puberty in boys.3,4
/ F6 R9 N: x, H. n4 G5 Z7 a6 uThe most common form of congenital adrenal% V9 j2 Z* l, a+ {: P( H# s
hyperplasia is the 21-hydroxylase enzyme deficiency.0 B. `0 m7 i) B* q" I0 E
The 11-β hydroxylase deficiency may also result in
3 K1 a( j" X& I) U( Q3 H* n/ ?excessive adrenal androgen production, and rarely,. O! |( a* ^; H9 x. P$ y$ r
an adrenal tumor may also cause adrenal androgen
6 G) m! w! L" b( X0 ~excess.1,3
4 x6 o9 B, f4 [4 d9 Z9 Vat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
# `. j! k. H- J( H. [542 Clinical Pediatrics / Vol. 46, No. 6, July 2007$ ^0 o3 p. x9 ^+ t, v1 M
A unique entity of male-limited gonadotropin-7 r& _ o3 s" c9 Z* @: q
independent precocious puberty, which is also known Q u; W1 ^, |, b) _5 o0 B
as testotoxicosis, may cause precocious puberty at a4 s$ f- p6 |/ q. [' k+ X2 ?+ r& k
very young age. The physical findings in these boys
. g9 N5 I9 C1 q& t) l' Xwith this disorder are full pubertal development,
- k7 Z9 P( z. q& vincluding bilateral testicular growth, similar to boys
v% z5 Q8 o& F8 M1 X1 {with CPP. The gonadotropin levels in this disorder3 w! I) r* N- O2 i
are suppressed to prepubertal levels and do not show: P* w/ I% d: J% k+ L, L
pubertal response of gonadotropin after gonadotropin-- ~9 x: Z t& j4 s, s- S4 y( x
releasing hormone stimulation. This is a sex-linked
( n8 |( Z' f0 [! ~. X2 r7 }autosomal dominant disorder that affects only
+ T8 D( {9 E4 N1 u- Hmales; therefore, other male members of the family/ q" y0 n$ K* n- [
may have similar precocious puberty.32 ^ A/ r Z6 n$ g1 y! _
In our patient, physical examination was incon-
7 }7 q0 g. f4 q- `# lsistent with true precocious puberty since his testi-
$ s. ]: O9 y; p( f5 @# Y0 Y( Icles were prepubertal in size. However, testotoxicosis
3 R7 p F6 L: }was in the differential diagnosis because his father+ D3 @0 V1 ~9 G
started puberty somewhat early, and occasionally,
, {: Y# s. ?' a% Btesticular enlargement is not that evident in the+ w+ X# T) p1 G9 c# q
beginning of this process.1 In the absence of a neg-
( H7 y" I( B8 Mative initial history of androgen exposure, our! R; R! k9 ]/ a& q) V* s
biggest concern was virilizing adrenal hyperplasia,
- l. W# e U+ U/ K+ neither 21-hydroxylase deficiency or 11-β hydroxylase
* h% J6 R9 Z6 V; Sdeficiency. Those diagnoses were excluded by find-
8 z4 z9 i" Z) I7 [1 B1 ling the normal level of adrenal steroids." V& p" Y1 d7 N" o3 D0 w
The diagnosis of exogenous androgens was strongly
: ?. }* G4 V b) |; P; S& gsuspected in a follow-up visit after 4 months because. \: b; N. I1 @$ W3 q" P
the physical examination revealed the complete disap-; y% P" T) d" y
pearance of pubic hair, normal growth velocity, and
9 k5 V8 E$ u! @2 K( bdecreased erections. The father admitted using a testos-/ e, r, y3 p5 _8 s$ |- [+ s4 l
terone gel, which he concealed at first visit. He was+ Z6 w- ^+ w' y; X# E; T5 E+ b p
using it rather frequently, twice a day. The Physicians’
, k, v1 q, L7 _ J/ v" Z8 }) ZDesk Reference, or package insert of this product, gel or8 ~" { c$ L, S' H% u
cream, cautions about dermal testosterone transfer to) l! { u0 b% [6 @, Y2 m
unprotected females through direct skin exposure.9 }- J2 G) Z% ?9 e x" t: k' H
Serum testosterone level was found to be 2 times the
$ B" c$ w* c$ r: \8 X. y+ jbaseline value in those females who were exposed to
: }1 i2 B7 U6 ^0 s, seven 15 minutes of direct skin contact with their male& B& \% S/ m$ x. \
partners.6 However, when a shirt covered the applica-* @; z8 L. m# H3 v
tion site, this testosterone transfer was prevented.
7 d/ \$ g1 ^) o; ~" GOur patient’s testosterone level was 60 ng/mL,
$ } u3 |1 A7 pwhich was clearly high. Some studies suggest that
. Z; s% U# z$ S' \6 X- ydermal conversion of testosterone to dihydrotestos-6 _/ [- f3 D7 X* O/ U
terone, which is a more potent metabolite, is more
9 o G7 ?+ K5 ?9 H; W" eactive in young children exposed to testosterone8 Y0 U. v/ h& U. o; u4 W6 Z
exogenously7; however, we did not measure a dihy-
* _5 f1 M" v5 I- `2 D. wdrotestosterone level in our patient. In addition to
+ z0 E: b% m7 r. w1 O) G- ~2 `virilization, exposure to exogenous testosterone in
7 k8 s$ n0 [1 k0 `, Mchildren results in an increase in growth velocity and
4 R4 g" Y0 v5 R; A2 Z/ Nadvanced bone age, as seen in our patient.
' Z1 R- O( e7 oThe long-term effect of androgen exposure during
7 i# h8 ?7 _' j. T( ~ `early childhood on pubertal development and final
3 z$ Y5 _4 @- O8 K: Qadult height are not fully known and always remain: N5 W- ]+ E9 ?! T
a concern. Children treated with short-term testos-
# @* M" R9 u2 r5 P' F+ t, |) u4 q( oterone injection or topical androgen may exhibit some9 A M5 s4 e6 n% H! F
acceleration of the skeletal maturation; however, after
" i' ^$ U5 Q, ~' F: |: Kcessation of treatment, the rate of bone maturation
; W! ]4 X4 y# z4 T, ldecelerates and gradually returns to normal.8,9
4 ^- F8 o2 N9 s5 y; mThere are conflicting reports and controversy# ?+ T- e4 T! r& ~& A- k) Z- `
over the effect of early androgen exposure on adult
! D1 h6 e1 U& r4 fpenile length.10,11 Some reports suggest subnormal- n9 `0 l6 U% ~
adult penile length, apparently because of downreg-4 [: _/ k0 E- Y
ulation of androgen receptor number.10,12 However,
& C5 D5 B7 k, d$ oSutherland et al13 did not find a correlation between
8 \4 J6 d7 Z# o, v% Cchildhood testosterone exposure and reduced adult
; A, V$ n% C7 R( epenile length in clinical studies.
; W8 N; a% M6 W4 [) ~4 zNonetheless, we do not believe our patient is
+ r$ Q, {5 `. @0 W9 `$ _& C$ n. h. R% ugoing to experience any of the untoward effects from
$ v i2 J% w" C* S" b$ d+ `+ atestosterone exposure as mentioned earlier because
3 r7 j6 r, N4 K4 wthe exposure was not for a prolonged period of time." }/ y7 @/ K7 z* V
Although the bone age was advanced at the time of
6 ~8 q1 X3 A6 X! j8 {% Odiagnosis, the child had a normal growth velocity at
" a8 b' {. N% m8 q+ J/ dthe follow-up visit. It is hoped that his final adult4 j' z5 v u5 t7 e- G6 F6 X+ K
height will not be affected./ K, g. h$ Z# c0 l* |$ o9 L2 ]
Although rarely reported, the widespread avail-8 L! a% A9 z# r7 l& x( t
ability of androgen products in our society may
" o9 ^& P8 T# \4 D, _; findeed cause more virilization in male or female: o* ]" Q4 e& g1 U
children than one would realize. Exposure to andro-
; L( t; Y$ m0 M9 x2 fgen products must be considered and specific ques-
* n( `9 I {% C" D, R# Q4 Z" Ationing about the use of a testosterone product or
3 w4 ^7 x h* A Cgel should be asked of the family members during1 ]+ h* y) Y `- `# H& k! v
the evaluation of any children who present with vir-
1 M, a* C$ i% o) Y# W: Filization or peripheral precocious puberty. The diag-
/ H9 g; y3 T! G$ L2 ?0 Knosis can be established by just a few tests and by1 q3 F% }6 E9 u
appropriate history. The inability to obtain such a
& N `2 L0 H( q5 i) Qhistory, or failure to ask the specific questions, may
* ^: ^% W4 w5 r( s y2 Jresult in extensive, unnecessary, and expensive
& N7 ^# u$ j' B( Cinvestigation. The primary care physician should be: p; j6 s$ K& j1 l8 s# F
aware of this fact, because most of these children- h& T1 q# \4 S% ] ?, c( X
may initially present in their practice. The Physicians’ c9 Y; O$ J0 o Y
Desk Reference and package insert should also put a
$ H5 A5 E4 \$ k% T# \* H: B, Z, Twarning about the virilizing effect on a male or
' T9 {9 @( ?3 p: [female child who might come in contact with some-6 z/ L2 P0 s/ N8 z3 |, v
one using any of these products.( Y0 n, {' t% E5 f: C3 W
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2. Rivarola M, Belgorosky A, Mendilaharzu H, et al. Precocious
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Dekker Inc; 2003:211-238.
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# W- f$ R6 ^1 O) Y( D; o6. Physicians’ Desk Reference. Androgel 1% testosterone,
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) w: `! M' \' R1 ^7. Klugo RC, Cerny JC. Response of micropenis to topical
0 y/ w2 Y3 M/ i# atestosterone and gonadotropin. J Urol. 1978;119:
8 O% `- H z T) X2 E! V; C8 t8 Z' @667-668.. D* {) l) g- W
8. Guthrie RD, Smith DW, Graham CB. Testosterone
, M3 n/ b: I4 l5 A1 rtreatment for micropenis during early childhood. J Pediatr.
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